Can I make use of MRSID files?

Some states, such as North Carolina, provide aerial imagery in the form of MRSID image tiles.

PC-GIS 9 and PC-GIS X can load MRSID files into Map View. It will let you convert the image into a .pim file, which you can load into iCMTGIS III or iCMTGIS PRO.

A geo-referenced image file is accompanied by a “world” file. With the SID images, the associated world file is the .sdw file. With geotiff files, the world file ends in .tfw. When downloading a geotiff or MRSID image, please make sure to download the associated world file to your PC as well. Also, find out which datum/coordinate system was used for creating the image file.

Then, you can use the “L” icon in PC-GIS 9 or PC-GIS X to load the image in the appropriate datum/coordinate system.

Unable to see Geotiff image in iCMTGIS III

Did you copy the associated .tfw file to the Documents folder for iCMTGIS III? Please see a related article we’ve posted previously at our blog site:

iCMTGIS III for Tree Inventory

“I am searching for a mobile GIS app to enable me to do some forest inventory. The property is about 100 acres. I am hoping you can help me determine which is any of your apps will be suitable: iCMGIS II or iCMTGIS III or iCMTGIS Pro. I invested in an Ipad and Bad Elf Pro+ Bluetooth GPS. I considered competing products GIS Pro and iGIS but ran into issues. I need to inventory tree features and collect attribute data by walking 20 meter (60 feet) wide strips on the property.
-the GPS function of the app guide me along lines 20 or 40 meters apart
-Import an image and geo-reference it for use in navigating my transects. I can convert the attached PDF to .tiff with adobe acrobat. I cannot afford to buy one of your mobile apps and also your PC-GIS, just to enable geo-referencing, so I hope there is a more affordable solution for that? I have used the app MapTiler to georeferenced the map.
– GIS function of recording the location of features and attribute data.
-ability to customise the data input tables for layer attributes. To name variables eg: tree number, species, diameter, height,
– ideally attach photographs to the records.
-I need to be able to export the GIS data to excel or csv file to process the data.”

Ideally there would be a forest inventory app for the iPad that works similar to our CMT-Forester 10 (for PC) and CE-CRUISE (for Windows Mobile PDA) software package. These apps will work up the weight or volume based on the timber cruising and the computation method used. However, we have not produced such a timber cruising app for use on the iPad.

As you will be exporting the tree data and do the computation elsewhere, iCMTGIS III may be a viable solution for you.

iCMTGIS III will let you import a Geotiff (geo-referenced .tif) image file for use as an off-line background image. Our PC-GIS X provides the function for geo-referencing a raster image. If you purchase iCMTGIS III from Apple, we can provide the PC-GIS X to you at a discounted price.

iCMTGIS III provides the Point Stakeout function to guide you to a location, and the Line Stakeout function to guide you along lines.

It allows you to take and attach photos to Features.

It will let you export Point Feature data to a text file that you can import into Excel.

It provides GIS functions for recording the location of Features and Attribute data.

It will let you customize the data input tables for layer attributes, and name variables eg: “tree number, species, diameter, height,” As you are collecting tree data for various transects, you will also need to add the Transect_No as an Attribute.

Please keep in mind that the mapping app will treat each tree as a separate Point Feature. In other words, it needs location information for each tree. Here are two ways to associate each tree with a location:

1. Record GPS position data for each tree and record Attribute/Values based on a Feature List. This may be more time-consuming, and you most likely are not interested in the actual location of each and every tree.

2. Define the Attributes for the Tree Topic layer. Roughly digitize a tree by tapping on the Add Point manually icon then tapping on the PickGPS icon. This will add a new record to the Sheet View for that Topic, and you can enter the Attribute information for the tree. Repeat for all trees to be inventoried.

When data for the Tree Topic has been collected, you can export it to a text file for your PC software to process.

Loading GeoTiff files into iCMTGIS PRO

“I’ve tried loading a georeferenced .tiff file (created with arcmap 10) into icmtgis pro.  When I select it from the list the app shuts down and doesn’t load the map.  Any ideas?”

Did you transfer the .tif file as well as the .tfw file to the Documents folder of iCMTGIS PRO on your device? The .tfw file contains the geo-referencing information and is necessary for displaying the GeoTiff map in the correct geographic location.

“Thanks so much, no I didn’t load the .twf file but also I was deflating the image when I first created it and the app didn’t like that.  Looks like it will work now.”

Meaning of working coordinate system in iCMTGIS III

“From the help file exported data will be in the ‘working coordinates’. How are the working coordinates defined? USGS geo tiffs are in UTMs. Does that become the working coordinates; or can decimal degrees or state plane coordinates be selected?”

Before loading the USGS GeoTiffs or importing Shapefiles, you will want to select in iCMTGIS III the same coordinate system as that used for creating the USGS GeoTiffs or Shapefiles. Please also make sure to select the proper distance unit.

After loading the USGS GeoTiff or Shapefiles, you can switch to another coordinate system of your choosing, such as SPC.
If you want to see angles displayed in decimal degrees, then under Setup select Elevation and Angle then select Degrees.

How do you load maps into the application, and is it possible to load a PDF or convert a PDF into a readable format?

iCMTGIS III can load geotiff (*.tif) files.If you have a geo-referenced .tif map image, you can use iTunes to copy it to the Documents folder for iCMTGIS III. Then in iCMTGIS III, select Main Menu\Background Map\Load Registered Image, and then select the .tif file. You must specify the correct datum and coordinate system for the image to load correctly. For example, if a DRG map uses NAD27 Conus UTM Zone 10, then use these settings to load the .tif file.

iCMTGIS III can also load a previously saved job map (.pmp) for use as Background Map.

Our iOS apps do not load GeoPDF map files as Background Map. We do have a software program called PC-GIS that can be used for geo-referencing an image by using a few control points. PC-GIS can also let you capture a geo-referenced Google Earth image and convert it to a .pim file that iCMTGIS III will be able to load. PC-GIS can also load geojpeg, geotiff, *.sid, and *.ecw images and convert them into .pim files.

If you are talking about viewing a PDF file, you can do so by using the View File option under Job – Export – Export to PDF. To do so, first copy the PDF file to the Documents folder for iCMTGIS III. Then select Job – Export – Export to PDF and mark the View File check box. Then you can select a PDF file to view its contents.

How does Moving Map work?

Moving Map

Moving Map

The iGPSGIS II, iCMTGIS II, iCMTGIS III, Forester GPS GIS III and Farming GPS GIS III apps provide a Move Map option under Setup\Navigation Settings.

With the Move Map option selected, when you move along, the GPS marker will always point up, i.e. the Map View will always show you moving straight ahead. Accordingly, the .pim or .tif background map will be reoriented, as indicated by the North Arrow.

The built-in Apple Map cannot be reoriented. Therefore, you must close the Map in order to work in the moving map mode.

The Move Map mode will let you set a margin so that while the GPS tracker is within the specified margin, the map will stay still and not be constantly moving and reorienting itself. This is particularly helpful for air-borne survey and data collection.

If you are just walking along, you will need to zoom into the background map to a small scale so as to see the moving map effect.

Please note that the moving map mode does not apply to the stakeout functions.

Farming GPS GIS III for iPad released

Farming GPS GIS III provides the functionality of the Farming GPS GIS II app plus a number of new functions. Most of these new functions were ported over from the PC-GIS PRO office software.

1. Additional data import and export formats

You will also be able to import and export data in Excel and KML formats.
Point Features can be imported and exported via a text file.

2. Contour / Volume

You will be able to create a contour map based on elevation or an attribute.
The contour information will enable you to compute volumes.

3. Load GeoTiff image

You will be able to load a Geotiff image for use as background map.
Such a background map does not require wi-fi connection.
The .tif map image can be used in the Moving Map mode for data collection.

4. Classify

You will be able to classify the Features and place them on sub-layers.

5. Insert or delete nodes

Now you will be able to modify the shape of a Line or Area Feature.
by deleting some nodes or adding some nodes then moving the nodes.

6. Go to and Sort

Jump to a Feature record by specifying the search criterion.
You will also be able to sort the Features based on an Attribute.

7. Report statistics

You will be able to view the statistics for a numeric Attribute of a Feature.

8. Batch delete by text file
You will be able to delete specific Feature records based on a text file.

9. Disconnect Feature

You will be able to easily disconnect Line or Area Feature into Points.
You will be able to disconnect a Line or an Area Feature into Lines.
You will be able to disconnect an Area Feature into two sub-areas.

10. Join Features

You will be able to join Points into a Line or Area Feature.
You will be able join two Lines together to form a new Line.
You will also be able join two Areas together to form a new Area.
(This function replaces the Combine function of Farming GPS GIS II).