Latest Contributions by GlenKilpatrick1

‎08-28-2015

Hi, I have another question about raster data. I have created a difference raster dataset by using the raster calculator as above. This is to calculate LiDAR accuracy by comparing a LiDAR survey raster DEM to a field survey raster DEM. However this analysis only applies outside of the water. I have polygons delineating the water and I need to find a way of clipping out the water sections of the raster or removing the values of these cells. The purpose for this is to be able to generate raster summary statistics for the area excluding water. Is there a function that can remove or null a small portion out of a raster data set? Regards, Glen

‎07-16-2015

Thanks for the assistance Jayanta, Renee and Mike. I was able to successfully create a DEM of difference. Will utilise the advise and ask questions if I have further queries. Regards, Glen.

‎07-12-2015

Hi, I am doing an undergraduate project on the use of LIDAR data for DEM generation and flood modelling. I currently have 2 LiDAR datasets for a broad area and a survey data set for a much narrower area within that. These data sets were captured at times before and after a major flood event. I need to carry out a series of comparisons of heights between the DEMs (average height difference between DTMs, a map showing the scale of elevation differences across the subject area). What would be the best geoprocessing functions to use for this purpose (I have created terrain datasets but ideally I would be working in raster format)? Also is there any way of checking up on the progress of a geoprocessing function prior to its completion? Just sometimes I execute a function but there is no evidence on the screen as to what is happening to a while later when it is completed. Regards, Glen Kilpatrick

‎06-22-2015

Hi Mr Boucher, I am currently performing a hydrologic analysis of a filled 5m raster DEM (dendritic). I have already been able to perform pre-processing via the basic dendritic terrain workflow in GP tools. However I am now trying to perform the Hydro Network generation. I am getting an error message shortly after executing the command. I have tried things mentioned including deleting the folders and geodatabases and starting again, setting geoprocessing extents, clearing temporary files. However I have not been successful. I will keep trying things but just wondering if you had any ideas on how to get around this? Regards, Glen

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Latest Contributions by GlenKilpatrick1

Re: DEM Comparison in ArcMAP

Re: DEM Comparison in ArcMAP

DEM Comparison in ArcMAP

Re: ArcHydro Problem Solvers

Re: DEM Comparison in ArcMAP