My Account     Contact Us     Cart

Best Practices for Processing and Importing Maps into the Avenza Maps App

Avenza Maps is capable of importing and displaying georeferenced maps in several different formats. The app processes a map by rasterizing and tiling it on import. The speed and result of processing will vary depending on the type of file used and the size and dimensions. We’ll discuss the types of files allowed and the advantages of each.

Usually larger files take longer to process than smaller ones with some exceptions. An image may have a very high resolution but a small disk size due to image compression. It is recommended that images be less than 100 megapixels for upload to the app. A geospatial PDF file with many vector features may also take a long time to process. In this case, you should convert the file to an image to avoid having to rasterize vector data in the app.

Maps can be loaded into the app faster by processing them before import. Maps can also be preprocessed by uploading them to the Avenza Maps Store or using the Export to Avenza Maps tool in Geographic Imager or MAPublisher.

Comparison of Allowed File Types

GeoTIFF

A GeoTIFF is a TIFF file (Tagged Image File Format) with spatial information embedded in the file. This format is typically the preferred format for uploading directly to Avenza Maps without preprocessing. Since this is an image format, the app does need to rasterize the file on import meaning processing times will generally be faster compared to PDF’s, and it will maintain the native resolution.

It is also possible to import a normal TIFF file by zipping it with a TIFF World File (TFW) and either a WKT or PRJ file which contains projection information. It is best not to do this for the sake of simplicity. Usually, any GIS software that can produce a world file will also be able to save to GeoTIFF.

Geospatial PDF

A Geospatial PDF stores spatial data in either raster or vector format as well as associated attributes and layer information. Files should comply with the Adobe Acrobat PDF 1.7 specification which has been standard since 2006.

Avenza Maps rasterizes geospatial PDF files on import which discards layer and attribute information. PDF files typically take longer to process than image files. There is also a chance that the file may process incorrectly (e.g. discarding labels).

Despite this, there are some instances when it may be preferable to use a geospatial PDF file. For example, the map may already be in this format and isn’t worthwhile to convert to another format. Geospatial PDF files tend to be smaller than image files so they would be a good solution if device storage space or download speed is an issue. Also, occasionally converting from PDF to TIFF degrades the image quality and may make maps illegible.

To ensure a geospatial PDF file has a good balance between size and quality, open the file in Adobe Acrobat and go to Advanced > PDF Optimizer. This is especially helpful if the map contains large raster images.

JPEG

JPEG is an image format like TIFF but it does not have the ability to store spatial information. To load a JPEG into Avenza Maps, it must be zipped with a JPEG World File (JGW) and either WKT or PRJ file. JPEG files are compressed so this may be an option to consider if file size is a consideration, however, a better alternative would be to compress a GeoTIFF file.

Processing Maps with MAPublisher, Geographic Imager, and the Map Store

It is best to process maps before loading them into the app because desktop computers are more powerful than mobile devices. It also avoids having to process the file each time the map is loaded onto a device. Geographic Imager and MAPublisher each have a utility to export to an Avenza Maps package with the capability to upload directly to the Avenza Map Store if you have a vendor account.

Running these utilities produces a folder that contains a ZIP file with a thumbnail to show a preview of the map, a reference file, and a folder called tiles that contains a tiled version of the map in PNG format. This ZIP file can be imported into the app in the same way as other files.

Uploading a map to the Avenza Map Store processes the map the same way. To use the store, register a vendor account on the Avenza Maps website.

Difference Between Lines and Tracks When Exporting from Avenza Maps

There are two methods of exporting GPS tracks from Avenza Maps in KML format: as a line and as a track. Which option to select depends on the intended purpose. Lines are much simpler than tracks and store only the position of each vertex in the line as latitude longitude and elevation. Tracks contain a complete description of how the path moves through space including the position at one-second intervals, the time at which each position was recorded, the compass angle of the heading, and the velocity. Lines take up much less storage space than tracks. To switch between exporting to Lines or Tracks, select Track Export in the Export Settings screen.

Export Settings screen

Tracks are useful in applications where the GPS position at a given time and space is important. For example, in Google Earth there is an option to record a tour that moves to predetermined places on the globe. This would be useful if you wanted to follow along on a hiking path or do a virtual walkthrough of a proposed building development. To make a tour from a track, open the KML file in Google Earth, select the track in the places panel, and click the Play Tour icon. The animation below shows a walk through Mount Pleasant Cemetery in Toronto, Canada. Lines contain only the location information: latitude longitude and elevation. Export to line when the time data is not important such as if you are making a map of a hiking trail.

Play tour in Google Earth
A tour of Mount Pleasant Cemetery in Toronto, Canada using Google Earth

KML Code for Lines and Tracks

KML (short for Keyhole Markup Language) is an XML notation for displaying spatial data in web applications. It was developed for use with Google Earth and can be read by many programs. Avenza Maps uses KML to import and export placemarks, lines, and tracks. You can view and modify KML files in any text editor. The KML element used for lines is called a Linestring which is defined as “a connected set of line segments”. A Linestring element contains a coordinates tag which is a list of longitude and latitude positions in decimal degrees and elevations in meters.

KML Linestring code sample

Tracks use the KML element “gx:Track” which contains several tags.

  1. when – the date and time a point was recorded in UTC
  2. gx:coord – the location of the point in decimal degrees and the elevation in meters
  3. gx:angle – the current heading in compass degrees (i.e. 0 degrees is north, 90 is degrees east and so on)
  4. gx:value tag defined as “speed” – the current speed in meters per second

There are equal numbers of each of these tags. A full description of the vertex includes all the tags in the same sequence. For instance, the first when tag, coord tag, angle tag, and speed tag, describe the first vertex in the track.

Track KML code sample

 

Exporting Photos From Avenza Maps For Use In ArcGIS

Avenza Maps Pro users can export layers to shapefile with associated photos. ArcGIS can display these photos using either hyperlinks or HTML popups. This post explains how to export your photos from Avenza Maps and display them in ArcGIS.

First, download and unzip these utilities. The general process for exporting and displaying photos is as follows:

  1. Export a shapefile with photos from Avenza Maps
  2. Unzip the exported files to your computer
  3. Open ArcGIS
  4. Add the shapefile to the map
  5. Save the map in the same folder as the shapefile
  6. Run the “Photo Shapefile Converter” tool
  7. Set the layer to display a hyperlinked photo and/or
  8. Set the layer to show an HTML popup

 

Exporting from Avenza Maps

First, export a layer that contains photos from Avenza Maps. Choose Shapefile (SHP) as the Export Format and ensure that Media Size is set to either Small, Medium or Large — don’t set it to No Photos. It is also possible with shapefile to set the Output Coordinate System to either WGS 84 (lat, long) or the native coordinate system of the map. The shapefile will export as a ZIP file with each of the component files of the shapefile and a folder called images.

Avenza Maps export settings

 

Display the photos in ArcGIS

Unzip the file on your computer and start a new session of ArcGIS. Load the shapefile into the map. Save the map document as an MXD in the same directory as your shapefile. The images folder should also be in this directory. The “Photo Shapefile Converter Script” creates fields with the path to the photos on your computer. It assumes the photos are in the same directory as the map. The script will not run if the map has not been saved.

Export folder

The shapefile has four attributes which are described below. The fields ‘name’, desc’, and ‘Photos’ have a maximum length of 254 characters. Because of this, ‘Photos’ can have a maximum of 13 photos.

  • name: From the placemark’s Title
  • desc: From the placemark’s Description
  • TimeStamp: The date the placemark was created
  • Photos: Relative paths to each associated photo separated by commas

Locate the Avenza Tools toolbox in the Catalog pane. Optionally, drag this toolbox to My Toolboxes for convenient access. Run the script Photo Shapefile Converter located in the Photos for Avenza Maps folder. Select the photo shapefile from the drop-down menu and click OK to run it. The script formats the shapefile to display photos using either a hyperlink or an HTML popup. Using the field ‘Photo’ as an input, it creates a field for each hyperlink (‘Photo1’, ‘Photo2’, etc.) and a field with the HTML code to display each photo in the HTML popup (‘HTML1’, ‘HTML2’, etc.)

Note: Photos exported from Android contain geotags and can be plotted in ArcGIS using the Geotagged Photos to Points tool. Photos exported from iOS do not have geotags.

 

Viewing Photos using a Hyperlink

Hyperlinked photos display in the default system viewer when the user clicks on the field in the info window or using the Hyperlink tool when a default field is set up.

  • Select the info tool and click a feature. Click on the lightning bolt icon and a photo will open in the default picture viewer
  • Open the layer’s properties and select the Display tab. Check “Support hyperlinks using field” and choose a field with a ‘Photo’ prefix (Photo1, Photo2, etc.). Click OK.
  • Select the Hyperlink tool from the ArcGIS toolbar. Click a feature and the associated image will open

 

Viewing Photos in an HTML Popup

To view as an HTML popup, open the layer properties and click “Show content for this layer using the HTML popup tool”, select “As formatted based on an XSL template”, and load the predefined XSL template ‘Avenza.xsl’. The XSL file determines how the HTML popup is formatted. Select the HTML popup tool (word bubble icon) from the toolbar and click a feature. The placemark’s title, description, and all associated photos are displayed in a callout.

Top Reasons to Create a Free PDF Maps Account

#1 – It’s free!

PDF Maps accounts are free for personal use.

#2 – It’s easy to do

Creating a PDF Maps account is quick and easy. It can be done in the app and takes less time than reading this blog post.

#3 – Have access to maps anytime

If you lose, break, change or upgrade your device you don’t lose the maps you have purchased. They are linked to your account, so you can always re-download them at any time. It doesn’t matter if you change brands or operating systems, your maps are always available.

#4 – Share maps on multiple devices

You can download any map you have purchased unlimited times onto five different devices.

See this Avenza blog article for advice on this process.

#5 – Better access to help

Having a PDF Maps account enables Avenza to provide you a higher level of support.

 

If you are interested in using PDF Maps in a commercial, governmental or educational environment please see PDF Maps licensing and contact Avenza Sales or see

Also, learn more about about PDF Maps on its dedicated site www.pdf-maps.com.

New Image Data Type Available in MAPublisher

Do you have pictures and images you want to insert as an attribute in MAPublisher?

MAPublisher 9.4 introduces a new data type called Image. To work with the Image data type, you’ll have to take a look in the MAP Attributes panel. The Image data type can be used in the same way as the other data types in the MAP Attributes panel. Use the Edit Schema dialog box to edit or create the Image data type as an attribute.

For this example, we have a point layer called “Point of Interests”. Let’s create a new attribute column with Image data type called “Picture”.

Edit Schema with a new data type "Image Data Type

We added a fourth attribute to this point layer (existing attributes were PlaceName, Note, and PhoneNumber).

Let’s insert an image into the attribute cell. Click the “No image…” hyperlink in the attribute cell. It will open the Edit Picture dialog box. Click Let's insert an image file to an attribute cell to browse for an image to add to the attribute cell. Once the image is added, a preview of the image will be visible in the Edit Picture dialog box.

Inserting a photo as an attribute value

There are other controls in this dialog box.

Edit Image Attribute Window: button for Select an image Select and insert an image to the attribute cell. Use this button to replace the existing image to something else. You can insert jpg or png file.
Edit Image Attribute Window: button for Export image attribute as jpg or png Export image as jpg or png
Edit Image Attribute Window: button for removing image from the attribute cell Remove image from the attribute cell
Edit Image Attribute Window: button for navigation control (zoom to fit) Navigation control – zoom to fit
Edit Image Attribute Window: button for navigation control (zoom to actual size) Navigation control – zoom to actual size
Edit Image Attribute Window: button for navigation control (zoom in) Navigation control – zoom in
Edit Image Attribute Window: button for navigation control (zoom out) Navigation control – zoom out
Edit Image Attribute Window: Textbox to change the name of the imageChange the name of the image

 

After clicking OK, the image will be listed in the attribute cell. The cell shows the file name of the image (it will be the file name of the image by default but you can change the name of the image to anything else). Also, hovering the mouse pointer over the image name in the attribute cell will show a quick preview of it.

An image file is inserted to an attribute cell as image data

The Image attribute type also supports images exported from PDF Maps (in KML format) and images exported to Google (in KML format).

 

The iTunes of Maps: A New Business Model for Map Publishers

Originally published in Directions Magazine. http://www.directionsmag.com/articles/the-itunes-of-maps-a-new-business-model-for-map-publishers/280993

By Joe Francica

Summary:
In September 2010, Avenza Systems, Inc. released the first version of PDF Maps for the Apple App Store where both free and for-pay versions of maps in the Geospatial PDF format could be downloaded for use with the iOS operating system. Currently, over 100,000 maps are now available for download. Are users likely to download maps normally found in a print version to their iPhone or iPad? Editor in Chief Joe Francica sat down with Avenza president, Ted Florence for more details on the “the iTunes of maps” business model – selling maps the way iTunes sells music.

Directions Magazine (DM): The transition from publishing printed paper maps to the digital world is a difficult one for many publishers who have been in the map business for many years. Why has the transition been so slow when we’ve had online mapping and the platform, the Internet, for many years?

Ted Florence (TF): Most publishers who have heretofore catered to the printed map audience have neither the means, the know-how nor financial capability to jump into the digital world, and hence a real catalyst was required. That is the essence of where Avenza’s PDF Maps app and digital map store solution come in. While the migration from analog product to digital product has unfolded over the last few years and the better part of the last decade for book and music publishers, map publishers (save for those with means of their own) have only been able to enviously sit back and watch as their printed map businesses have started to struggle. And recognizing that catalysts like Apple, with iTunes and iBooks, and Amazon, with Kindle, have made themselves available to music and book publishers, one could argue that were it not for those catalysts, music and books may not have made the migration either. Furthermore, the cost of transitioning can be very expensive and even prohibitive for many publishers, not to mention that undertaking such major initiatives as creating their own app or mapping device could likely distract most publishers from their main business of producing and delivering maps. So again, despite the fact that the paper or analog to digital transition has proven to be a viable model in the book and music industries and the demand for digital maps has increased with the advent of powerful smartphones and tablets, the map industry has lacked a similar manner of both transitioning and ultimately transacting in maps and has thus been faced with the simple dilemma of how to make that transition, at least until now.

DM: You’ve come up with a new model to support the transition by taking the archive of printed maps and exposing a new delivery method for the publishers. Can you explain the business model in some detail?

TF: The business model for the Avenza PDF Maps app and map store solution is very simple. Think of it basically as iTunes or Kindle but for maps.

The PDF Maps app and solution is an all-encompassing solution for the use, distribution and sale of digital versions of paper maps to mobile devices. Similar to iTunes for music, the Avenza PDF Maps solution includes both an app for users to discover, purchase and use maps directly from and to their devices, as well as a back-end store to facilitate the transaction and delivery of the maps. The app on the smartphone or tablet device contains all the functionality for using maps both on- and offline, including locating oneself, measuring, plotting points, importing and exporting points, and much more, all of which goes well beyond traditional paper map usage. Users can carry around dozens of maps on their device just like they are now accustomed to carrying around a library of music or books. On the other side of the equation, and again like iTunes and Kindle, the app has a built-in map store which connects users to a vast and growing library (currently over 100,000 titles) of maps from around the world and representing multiple genres and publishers. Users may browse and search through this catalog and quickly and easily find, purchase and download the map or maps of their choice, may of which are offered free of charge. Maps are then immediately and automatically delivered wirelessly to the device.

Any geo-referenced map may be uploaded to the system and made available for purchase in a fully electronic manner similar to the way in which music, videos, books and apps are currently sold and delivered.

Additionally, users may add their own maps directly into the Avenza PDF Maps app via a variety of methods. This is particularly useful for private and public-sector organizations that have a need to use their own private maps out in the field while doing work on tablets or smartphones such as iPads and iPhones. So the insertion of maps into the app is not exclusively dependent upon a purchase and download from the in-app map store.

DM: If your new model is essentially “the iTunes of maps” why wouldn’t one of the larger publishers like National Geographic or Rand McNally try to use their brand to do this themselves?

TF: This is certainly an option for all publishers, and some will do that, however, as many publishers are finding, the development and ongoing maintenance of such a dedicated app is very time-consuming and costly. That is why one of the business models in the Avenza PDF Maps solution is a customized or OEM offering of the Avenza PDF Maps app whereby publishers can avail themselves of the functionality and transaction model of the Avenza PDF Maps solution without the time and overhead required to do it all themselves. Moreover, though, as we look at the trail blazed in the music and book industries by iTunes and Kindle, we find that all the various publishers have gravitated to a one-size-fits-all solution in which all music publishers provide their offerings through a single place, iTunes, and all book publishers do so though a single place like Kindle or iBooks. What we do not see are dedicated apps for each publisher. We do not see individual music players and digital stores for Sony, Arista, Def Jam or Geffen nor do we see individual readers and digital stores for Penguin, Random House or Harlequin. Furthermore, on the user side, the fragmentation of the offerings is really not ideal or desirable as users do not want to have dozens of music and book apps on their devices in order to find, maintain and use their content. Simply put, why reinvent the wheel? We have seen how successful the digital music and book transition has become under this model, so why should we try to be any different in transitioning the map industry?

DM: Give us a better understanding of the app delivery method. How do you envision the store to function and what “departments” will you have in the store to make it easy to find content?

TF: Just like with iTunes, iBooks and Kindle, users can access a digital map store directly from within the Avenza PDF Maps app on their device. From within the map store they can browse various map categories or genres such as tourist, transit, recreation, nautical, aeronautical and special purpose, or enter any search term that might apply to a map they are looking for such as a geographic place or term or a particular map use case such as cycling or camping. Additionally, the map store interface allows for finding maps near to one’s current location, browsing recent additions to the map store and browsing the most popular maps at the time. Searches by publisher or brand may also be performed should users have a particular brand or publisher loyalty.

Once they have located a particular map of interest they can simply touch the listing to reveal more information about a map such as publisher, date of publication, file size and full description and even see a full preview of the map in order to feel comfortable that they have found a map they want to purchase. Then, as is done with music in iTunes, they simply touch the “buy” button and complete the transaction.

On iOS devices (iPads, iPhones and iPod Touches) the payment comes seamlessly via the user’s iTunes account and then the map is delivered to the device. Essentially the system functions with the same elegance and simplicity that users are accustomed to when purchasing music and books.

DM: What does the store look like in three years? How do you envision the model developing over time?

TF: Currently there are over 100,000 maps in the map store from over 200 government and commercial publishers and more are being added all the time, every day. We expect this to continue to grow and eventually become the de facto place to purchase maps, much like iTunes has become the place to get music. It would not surprise me at all if we had over one million maps and many millions of users within two to three years. Just ask yourself this: If you need a map of a particular place for a particular use on your device, do you know where to get it? Well, we intend to answer that question for everybody, with the answer being the Avenza PDF Maps store.

There is no other model like this catering to the map industry and as more and more users discover it and more and more publishers realize it to be a viable and costless solution for them to enter the digital map business we see it indeed becoming the iTunes of maps.

We are currently working on an Android version of the solution followed by Windows Mobile and possibly Blackberry, as well as a Web-based interface and store for users who might prefer to do their map shopping on a computer screen rather than on the mobile devices themselves. This is something that music and book purchasers are already able to do, so why not maps as well? As these platforms are unveiled, continued growth is anticipated as new audiences get added. There is no doubt that there is a demand for this type of user and publisher solution so essentially the sky is the limit.

Sell Your Maps Digitally to Mobile Devices

As we have all seen over the last decade, the distribution and consumption of music, videos and books has moved to a digital model and so, the question then becomes, why not maps? Similarly to the aforementioned media types, maps are also very conducive to both the distribution and use in a digital and mobile way. As we see organizations like Borders, Blockbuster and Kodak succumb to this digital revolution, we map-makers must adapt or suffer a similar fate.

Many of you may be struggling with the issue of selling your maps digitally, tackling the question of the “mobilization” of your content and wondering how to attack the new markets.

But what if there were a generic iTunes/iBooks/Kindle type environment where a map publisher, like many of you reading this, could offer their maps for sale just like musicians and book publishers currently do with their songs and books? There is and it’s called the Avenza Map Store, accessible through the PDF Maps app.

Right now, the Avenza Map Store has more than 100,000 maps from publishers all over the world and we are looking for more as we strive to become the “iTunes of maps”. Map sales in January have already more than doubled December in terms of both units and dollars and December was higher than previous months already.

Signing up to become a map store vendor is free. We encourage and invite everyone to do so.

So here is the gist of the system and the thinking behind it.

 

What is PDF Maps?

The award winning PDF Maps app is an all-encompassing solution for the use, distribution, and sale of digital versions of paper maps to mobile devices. It includes both an app for users to use, discover and purchase maps directly using their devices as well as an in-app store to facilitate the transaction and delivery of the maps.

Think of it like iTunes, iBooks or Kindle, but for maps.

The app loads georeferenced maps and has functionality for locating (via GPS), measuring, plotting points, importing and exporting points and much more, this goes well beyond traditional paper map usage.

 

Why PDF Maps? What are the advantages?

The PDF Maps app and the connected map store responds to the demand of both map users and map producers for a 21st century digital map consumption and delivery solution. In an era where a vast amount of content is shifting from analog to digital delivery and use, the map industry demands a similar solution for its users and producers.

For the user it solves four major problems:

  1. How can I use a map I really like on my mobile device instead of the often less-desirable ones Google and other streaming services offer?
  2. Google and other streaming services fail to perform when there is no Internet connection such as when hiking or traveling in remote unconnected areas.
  3. Services that rely on a bandwidth connection are very undesirable when outside your home network area due to the high cost of data roaming charges.
  4. Google and other streaming services, as well as many existing mobile apps, do not always offer a useful map for a particular purpose such as hiking, boating, and visiting national parks which leaves much desire for a “better” map.

 

For publishers it responds to the following specific needs:

  1. With paper map sales declining, how can I get my content into the digital age for the mobile device market?
  2. Devices like Garmins, TomToms and in-car navigation systems are usually closed to outside map content and thus map producers cannot easily, if at all, make their maps available to users of these systems.
  3. In an effort to get into the digital marketplace it has to be easy, efficient, and inexpensive to repurpose existing content and map libraries. In most cases existing map libraries can be easily ported to the PDF Maps system and existing production processes do not need to be drastically modified, if at all, in order to produce new content for PDF Maps and the Avenza Map Store
  4. With digital map use there is no printing, production quantity guesswork, inventory to manage, distribution and returns to account for.
  5. Updates to the maps are controlled by the vendor and can be instantly made available to the marketplace, while at the same time, older redundant content can be instantly removed and discontinued.
  6. Immediate, easy and effortless entry into the digital map marketplace.

 

Available now for iOS. For more info visit PDF Maps site and the Avenza Map Store site.

Hope to see your content in the map store soon.

PDF Maps on Daily Planet [VIDEO]

[Video archived] Ted Florence provides a demonstration of the PDF Maps app for iPad. He compares a basic looking Google map of Algonquin Park to a very detailed map of the park which is available on the Avenza Map Store. Combined with using the built-in GPS, it provides a great offline navigation solution.

In addition to showing off the map, Mr. Florence loads a TTC map of Toronto and imports waypoints shared through email. This feature allows for collaboration between people who use the same maps. Importing and exporting waypoints can also be done through Dropbox or iTunes, as demonstrated here. Look for more sharing options in future releases.

PDF Maps is available on the App Store.

Geospatial PDF in Adobe Acrobat: Examining latitude and longitude values

After creating a map with MAPublisher or Geographic Imager, you might want to export it as a geospatial PDF file. You want to ensure that the georeference information of your Geospatial PDF files are correct before bringing them into the field for use. A great way to use geospatial PDF maps (and GeoTIFFs) is to load them onto an iPhone, iPad, or iPod touch with PDF Maps installed.

One way to check for georeference accuracy of geospatial PDF files is to use Adobe Acrobat. Open the “Analysis” tool from View > Tools > Analyze.

Adobe Acrobat: Opening Anlysis Tool

Click the “Geospatial Location Tool” from the Analyze panel.

With the Geospatial Location Tool enabled, you can see the latitude and longitude values of the map while you move the mouse over the opened Geospatial PDF file.

Geospatial PDF viewed in Adobe Acrobat

An important tip you should keep in mind: you need to set the preference option for this tool correctly depending on the coordinate system of the map in the geospatial PDF file.

Open the Preference dialog window:

Acrobat X on Windows: Edit > Preferences > General …
Acrobat X on Mac: Acrobat > Preferences …

In the Preference dialog window, find the preference category “Measuring (Geo)” from the list of categories.

Adobe Acrobat Preference dialog window

In the “Measuring (Geo)” category, take a look at the right side. There are many options for the georeferencing tool. One of the options is “Latitude and Longitude Format”. In this section, you have a checkbox option “Always display latitude and longitude as WGS 1984”.

Adobe Acrobat Preference option for Latitude Longitude Display

This option is very important. If the coordinate system of the map is “NAD 27 / UTM Zone 16 N”, which geodetic system would you like to have to show the latitude and longitude values in Adobe Acrobat? For example, if you are checking the latitude and longitude values in the WGS 1984 geodetic system, you should keep this option selected. However, if you are checking the latitude and longitude values in NAD 1927 geodetic system, then you should de-select this option. The difference in the distance at the same spot between two different geodetic systems may be small or large. If you would like to see the correct latitude and longitude values, you should be aware of this option.

Privacy Preference Center

TEST TAB

Track anonymous usage

tracking

Close your account?

Your account will be closed and all data will be permanently deleted and cannot be recovered. Are you sure?

Are you sure?

By disagreeing you will no longer have access to our site and will be logged out.