DEM Accuracy Assessment | SRTM ASTER DEM DTM | RMSE | ArcGIS/ArcMap

[@priscillaonyechi6244]

Pls do u have a video on accuracy assessment of DTM using LOOCV

[@musaibahmad9669]

Thanks for the informative video.
Whether the both dems (Lidar and topgraphic) had same resolutions? If not, how can we subtract two dems of different cell sizes?

[@ziadabdeldayem6884]

Hi Musaib. Yes you can subtract two different resolutions.

[@musaibahmad9669]

@@ziadabdeldayem6884 Thanks for the reply sir.
In that case can we resample our less resolution DEM (12.5 m) to a high resolution (1m) and then subtract two Dems for evaluating the difference between them.
P.S: I know resampling will not increase the accuracy but I just want a dem finer cell size (1m). All I am worried about is that whether resampling can change the original/ actual elevation values.

[@havalsadiq3655]

Thanks for the video, it was simple and informative.

[@ziadabdeldayem6884]

Thanks.

[@herexcellencymel6959]

hi. why did you do "map - lidar" and not "lidar - map" to create the error maps?

[@nastaran1010]

Hi. If you have a dataset that contains elevation information associated in feet and you want to make a comparison with another dataset that is in meters, it is necessary to convert the data in the same units?

[@ziadabdeldayem6884]

It depends on the comparison techniques that you are going to apply.

[@nastaran1010]

@@ziadabdeldayem6884 I have two DTM file. next, I want to compare both of them together. Bothe of them have only angular unit and do not have linear unit. so how can I know the cell size of them is according to what unit? meter or feet.

[@tadesseberhe8011]

how to determine drainage slope in the town( work drainage) or at each interval.

[@ziadabdeldayem6884]

.

[@akill_er]

How to find skewness and kurtosis…?

[@yawtube7522]

thanks for the video, I want to assess the vertical accuracy of photogrammetry DTM using GCPs...how can I do it?

[@ziadabdeldayem6884]

You need to compare the elevation values at each point (x,y).

[@yawtube7522]

@@ziadabdeldayem6884 yes

[@yawtube7522]

if possible please do a video on it

[@MohamedMohamed-eq6or]

Thanks

[@ziadabdeldayem6884]

Thanks.

[@MohamedMohamed-eq6or]

Please, how can I make a digital model that combines two different types of data, for example, a model of level points, a topographic map, and another digital elevation model together in one form. Please advise

[@ziadabdeldayem6884]

@@MohamedMohamed-eq6or Yes, you can.

[@MohamedMohamed-eq6or]

@@ziadabdeldayem6884 How

[@MohamedMohamed-eq6or]

possible way

[@tadesseberhe8011]

thank u.

[@priscillaonyechi6244]

Pls do u have a video on accuracy assessment of DTM using LOOCV