topic DTM AND DSM in Python Questions

DTM AND DSM

tinigjeo — Sat, 05 Aug 2017 16:24:21 GMT

how could import dtm and dsm on gis 10.4.1?

Re: DTM AND DSM

DanPatterson_Retired — Sat, 05 Aug 2017 18:30:37 GMT

From what? But maybe this?....

Re: DTM AND DSM

XanderBakker — Sat, 05 Aug 2017 19:18:39 GMT

Please specify in what format you have the DTM and DSM data.

Re: DTM AND DSM

tinigjeo — Sat, 05 Aug 2017 20:43:52 GMT

I will send the image what could i do now for import

Re: DTM AND DSM

DanPatterson_Retired — Sat, 05 Aug 2017 22:55:23 GMT

did it come from Golden Software ... grd is one of their file extensions.... supported raster formats It is a supported file format, but they don't indicate whether you need the Spatial Analyst extension to use it... but try it in arcmap with the Add Data button first

Re: DTM AND DSM

tinigjeo — Mon, 18 Dec 2017 11:44:17 GMT

YES IS THE SAME QUESTION

ON ARCMAP IS NOT IMPORTED HOW CAN I DO ?

CAN YOU HELP WITH ONE VIDEO IF YOU HAVE EXAMPLE FOR THE RIGHT STREET

Re: DTM AND DSM

DanPatterson_Retired — Mon, 18 Dec 2017 13:35:15 GMT

your caps lock is on...

couldn't find any videos...sorry

Re: DTM AND DSM

tinigjeo — Mon, 18 Dec 2017 13:59:33 GMT

can you send me one idea what can I do?

Re: DTM AND DSM

XanderBakker — Mon, 18 Dec 2017 14:55:29 GMT

I might be easier to help you if you could share a sample file.

Re: DTM AND DSM

tinigjeo — Mon, 18 Dec 2017 18:13:49 GMT

give me the email and I will send my file

Re: DTM AND DSM

XanderBakker — Mon, 18 Dec 2017 18:46:03 GMT

I have unmarked my answer as the correct one, since no solution was provided. Is the file very large or is it not possible to attach a sample file to the thread? You will have a higher chance to get a solution if more than a single person have access to this file. If you are not allowed to share it publicly, I can provide my contact info.

Re: DTM AND DSM

tinigjeo — Mon, 18 Dec 2017 19:39:14 GMT

ok give me your contact info

Re: DTM AND DSM

XanderBakker — Mon, 18 Dec 2017 20:10:14 GMT

You can send me an email using xander_bakker [at] yahoo.com

Re: DTM AND DSM

tinigjeo — Mon, 18 Dec 2017 20:26:37 GMT

I send te file now ......

Re: DTM AND DSM

tinigjeo — Mon, 18 Dec 2017 20:27:14 GMT

ok I send now you can see .....

Re: DTM AND DSM

XanderBakker — Mon, 18 Dec 2017 23:41:51 GMT

Sorry for the delay. The file can be read without any problems into Desktop (see screenshot in ArcMap below) no conversion required:

The steps are easy, assuming you have ArcMap or ArcGIS Pro:

1) In ArcMap, click the add data button:

2) navigate to the folder where the file is or files are stored, select the file and click on the Add button:

As a result the file will be added to the TOC and you can start to manipulate the file. Please note that the file as you shared does not have a projection and you should use the Define Projection—Help | ArcGIS Desktop tool to assign the appropriate projected coordinate system.

As far as I can tell the raster is a classified raster where you will only have values in steps of 100m (no intermediate values). To get something "useful" you may need to extract the contours every 100 meters with Contour—Help | ArcGIS Desktop followed by Topo to Raster—Help | ArcGIS Desktop to interpolate the contour lines and create a real DEM.

Re: DTM AND DSM

DanPatterson_Retired — Tue, 19 Dec 2017 00:34:12 GMT

.....but try it in arcmap with the Add Data button first ....

suggested before in an earlier post of mine...

I wonder why it didn't work before???

Re: DTM AND DSM

tinigjeo — Tue, 19 Dec 2017 08:16:51 GMT

I have arcmap I will try

Re: DTM AND DSM

tinigjeo — Wed, 20 Dec 2017 08:19:08 GMT

yes its open on arcmap but i have try to import lat,lot point but inst simple for import and

what can I do for this import point in dtm or dsm ?

Re: DTM AND DSM

XanderBakker — Wed, 20 Dec 2017 11:40:55 GMT

I believe the the original question on how to open the file in ArcMap has been resolved, basically with the suggestion that Dan Patterson made earlier in this thread "but try it in arcmap with the Add Data button first", which worked. I added some images to make it more visual, and detected some problems with the data.

As far as I understand, you have a follow-up question about the coordinates and mention importing a lat, lon point. I guess you refer at defining a coordinate system since the data has coordinate which range from 39,281,738 to 39,377,938 in X (lon) and 458,760,736 to 458,785,736 in Y (lat):

Those are very high values for coordinates. Normally when you obtain data the data will be accompanied by some metadata explaining the content and in this case the coordinate system. You should ask the owner of the data when spatial reference and units have been used for this dataset. Only then you will be able to assign the correct coordinate system to the data (so it will know its location in the surface of the earth) and you are able to project the dataset into another coordinate system in you you require geographic coordinates (lat and lon). If you do not have information about the data and its coordinate system you will need to "guess" which coordinate system it is, by using knowledge of the area it describes with all the possible consequences of errors. The other aspect still remains; the dataset is not really a DEM or DTM. It is a classified derivative and should be treated as such. For example you cannot create a slope map from this raster or calculate aspects or do any hydrological analysis on it.Be aware of that.