BC Albers Projection

BC Albers Coordinate System Setup in PC-GIS

“I just purchased iCMTGIS Pro on iTunes AppStore, and I’m wondering how I can collect data in the BC Albers coordinate system. I found some documentation on your support page that indicates this can be done with PCGIS or PCGPS, however I don’t want to buy an extra piece of software to create one file. Would you be able to provide the file for me?”

Besides providing the ability to set up user-defined datums and coordinate systems, PC-GIS X will let you geo-reference an aerial photo or engineering design drawing, work with the iCMTGIS PRO job data, copy a Topic layer from one Job file to another, and print a nice map to printer or PDF, complete with a north arrow, a scale bar and your logo or some other image.

BC Albers is based on the NAD83_CORS96/CSRS98 datum. If you have the PC-GIS, PC-GPS or PC-MAPPER software program, you can set up the projection as shown in the above user-defined coordinate system setup screen.

If you don’t have our PC software, but would like to work in the BC Albers projection, you can download BCAlbersUserCor.zip from
http://cmtinc.com\technical_support/Outgoing

Then, unzip the file and copy user_cor.sys to the documents folder of your iCMTGIS PRO. Close the app then start it again. Then BC Albers should be available as a user-defined coordinate system. This user_cor.sys file will also work with the iCMTGIS II/III, iGPSGIS II, Forester GPS GIS II/III, Farming GPS GIS II/III and Utility Data Collection apps.

A word of caution:
When you copy the user_cor.sys file to your iOS app, it will replace any existing user_cor.sys file. Therefore, if you are using other user-defined coordinate systems, please first use the PC software to add the new coordinate system then transfer the user_cor.sys file that contains all of your user-defined coordinate systems to your iOS app.

Matching up iCMTGIS PRO job data and AutoCAD drawings

“We recently purchased the iCMTGIS PRO app and are using it along with the EOS Arrow 100 gps receiver and running it on an Apple iPad A few things we are trying to do and have been unsuccessful at are getting the points we used the app to gather into AutoCAD 2014 drawings properly. Also we would like to be able to geo-reference PDF’s of job site drawings and be able to lay them out on the app so that proposed buildings can be located on a site. We use Adobe Acrobat 9 Pro Extended for PDFs and run AutoCAD 2014 on windows 10. Looking at cmtinc.com we are curious if the PC-GIS software would give us these capabilities or if we would need another type of software that would suit our needs.”

1. Loading iCMTGIS PRO job data into AutoCAD

To get the collected data points to the correct location in an AutoCAD drawing, the coordinate system used in iCMTGIS PRO must match that used in the AutoCAD drawing. Please refer to the following articles:

https://knowledge.autodesk.com/support/autocad-map-3d/learn-explore/caas/CloudHelp/cloudhelp/2019/ENU/MAP3D-Use/files/GUID-D6763C82-7281-4369-BE9D-6DB560519573-htm.html

https://knowledge.autodesk.com/support/autocad-map-3d/learn-explore/caas/CloudHelp/cloudhelp/2019/ENU/MAP3D-Use/files/GUID-8A02D384-B075-4459-8E23-ED7D1C0F3D8F-htm.html

Alternatively, you could create a NEZ Coordinate System in iCMTGIS PRO as mentioned in 2.1 below, then switch to that User-defined Coordinate System in iCMTGIS PRO before exporting the points to DXF.

If you regularly use a certain scale and point of origin in AutoCAD, it will be helpful to create the corresponding NEZ Coordinate System in iCMTGIS PRO for repeated use.

2. Loading design drawing into iCMTGIS PRO

2.1 If you have the design drawing in DXF format, you could consider the method described in this blog post:

https://icmtgis.wordpress.com/2015/11/28/how-to-line-up-dxf-exported-from-solidworks-with-deed-calls-in-forester-gps-gis-ii/

2.2 PC-GIS X provides a Geo-referencing function that will let you geo-reference a raster image based on three or more known coordinates. You can export your PDF as an image (e.g. *.tif) file.

For a demo of the geo-referencing process, please see the video at the “Geo-referencing DEMO” link under Presentations on the right side of our blog page.

You can use your iCMTGIS PRO to record the reference points. To do so, stand at the point on the ground that corresponds to an easily identifiable point on the image and record a Point ( e.g. for 10 minutes). Do so for three or more other points. Some of the points should span an area that covers your job site. Transfer the .pmp file to your PC. Then you can call this job file up on the left panel in the geo-referencing screen.

Is CMT working towards including the OCRS within the ICMT GIS PRO software?

“I am using the EOS Arrow 200 with ICMT GIS PRO on an Ipad. I am wanting to transform my GPS points to the low distortion projections Oregon Coordinate Reference System. I haven’t been able to create a user defined projection to match the OCRS zones. My questions for CMT: Is CMT working towards including the OCRS within the ICMT GIS PRO software? If so would this be available as an update any time soon? If the OCRS zones are not going to be available for ICMT GIS PRO- would the PC GIS PRO software work to build the OCRS zones to download into ICMT GIS PRO?”

Thanks for using our iCMTGIS PRO. This app has the standard LLA, UTM and State Plane coordinate systems built in. Different states and countries (e.g. SWEREF99TM for Sweden, KTM-KUDAMS for Kuwait) might use different projections. You can use the optional PC-GIS X software to create user-defined datums and Transverse Mercator, Mercaator, Oblique Mercator, Lambert Conformal Conic, Albers Equal Area Conic and Double Stereographic projections. After you have copied the user_dat.sys and user_cor.sys files created by PC-GIS X to your iCMTGIS PRO documents folder, iCMTGIS PRO will let you select the user-defined coordinate system to use.

As the OCRS zones refer to the NAD83 datum, you don’t need to create a new datum.

User-defined projections

“. . . we would like to know by PC-GIS software possible to establish our Coordinate system (KTM Projection and GRS 1980 Datum) to use it in iCMTGIS Pro software?”

The KTM-KUDAMS projection for Kuwait is based on the Transverse Mercator projection. You can use the PC-GIS X software to create a user-defined coordinate system by entering the parameters for this projection. Then please copy the user_cor.sys file created by PC-GIS X to your iCMTGIS PRO documents folder. Then iCMTGIS PRO will let you select the user-defined coordinate system to use.

Sweden needs help

“We are trying your app iCMTGis II for ipad but we use the coordinate system SWEREF99TM is it possible for us to project in this system so that we can use our own shapefiles from ArcGiS, i.e. do your program convert shapefiles or do we need to change the coordinate system and how do we do it? Secondly we have major difficulties to import shapefiles, eventhough we can see them in the app in Itunes, they do not show up in the import.”

1. Coordinate system
In ArcGIS, please switch to a standard coordinate system (such as LLA or UTM) then export the Shapefiles. In iCMTGIS II, set the coordinate system to be LLA or UTM accordingly. Then import the Shapefiles into iCMTGIS II.

If you wish to use the SWEREF99TM in iCMTGIS II, you could use our PC-GIS PRO 09 software to set up a user-defined coordinate system then copy the user_cor.sys file (with the file name in lower-case letters) from your PC to the documents folder for iCMTGIS II on your iPad device.

2. Shapefiles import
Please make sure all the associated files have been copied to the Documents folder for iCMTGIS II (*.shx, *.shp, *.dbf, *.prj). The file names should be in lower-case letters and numbers. The procedure for importing Shapefiles are discussed in our blog article at:
http://wp.me/p1v4kh-lu

Also, please check your iCloud setting under Main Menu/Setup.
If the check box for Job is marked, the app will look for the .pmp job files and the Shapefils in iCloud storage. To see the files in your local documents folder, please un-mark this check box then tap the OK button.

The above information also applies to the iGPSGS II app for use on the iPhone.

I just downloaded the new app for the Ipad (Forester GPS GIS App). Could I get the user defined Michigan Georeference coordinate system patch?

You have already created the user-defined coordinate system for Michigan in your CMT-Forester 10 PC software. Information for user-defined coordinate systems is stored in the user_cor.sys file.

To make the user-defined coordinate systems available for use with the Forester GPS GIS app on the iPad, simply copy the user_cor.sys file from your PC to the documents folder for the Forester GPS GIS. If you have user-defined datums as well, then also copy user_dat.sys to the app’s documents folder. If you have defined plain NEZ coordinate system using your PC software, then also copy user_pla.sys to the app’s documents folder. Please change the file names to be in lower-case letters before copying them to the iPad.

iCMTGIS II, iGPSGIS II, Utility Data Collection, Forester GPS GIS, Forester GPS GIS II, Farming GPS GIS and Farming GPS GIS II provide the ability to use various standard coordinate systems as well as special coordinate systems defined by using our PC mapping software. These apps will also let you define a local NEZ plane in the field.

Can you add POSGAR94 for Argentina to the iCMTGIS II software?

POSGAR94 Zone1

iCMTGIS II and iGPSGIS II can work with a user-defined coordinate system that you have defined using your PC-GIS PRO. Shown here is the screen for entering the projections for Zone 3 for POSGAR 94. You can follow this example to enter the parameters for the other Zones, which differ in the Central Meridian and False Easting values.
After you have entered the data for the seven Zones, change the name for the User_cor.sys file in the PCGIS9 folder on your PC to be in lower-case letters. Then use iTunes to copy the user_cor.sys file to the Documents folder for your iCMTGIS II or iGPSGIS II. In iCMTGIS II or iGPSGIS II select Setup – Coordinate System then select User Defined to access the new coordinate system.

What is a user-defined coordinate system?

The LLA and UTM coordinate systems are generally accepted coordinate reference systems worldwide. However, some states in the USA, such as Michigan, Mississippi and Oregon, adopt their own plane projection as a standard spatial reference for their state agencies to present their spatial data and maps. Other regions in the other countries may also have their own  spatial projection standards.

PC-GIS, PC-GPS and PC-MAPPER will let you define your own datum and enter the specifications for a projection plane  based on the Transverse mercator, Mercator, Oblique mercator, Lambert conformal conic, Albers Equal Area conic, Double Stereographic projection. The user-defined coordinate systems are stored in the file named user_cor.sys. You can add this file to the Document folder for the iCMTGIS or iGPSGIS via iTunes. Then your user-defined coordinate systems will become available in the iCMTGIS and iGPSGIS apps, and you may select one of them as the active coordinate system.