topic Re: Help with applying Vertical coordinate transformation to a terrain dataset in ArcGIS in Data Management Questions

Help with applying Vertical coordinate transformation to a terrain dataset in ArcGIS

ErnestFonyuy — Fri, 05 Mar 2021 14:00:10 GMT

I have a 1/3 arc-second DEM terrain data (tif) retrieved from the national map.

The horizontal coordinates are in degrees and the vertical coordinates are in meters.

I want my horizontal coordinates to be in NAD_1983_StatePlane_Texas_South_Central_FIPS_4204_Feet. So I performed a geographic coordinate projection.

Now I want my vertical coordinates to be referenced to : NAVD88_height_(ftUS). Should I now just perform a vertical coordinate projection and my elevation values will be converted to feet?. Or do I have to manually convert using raster calculator after performing the vertical projection?

Re: Help with applying Vertical coordinate transformation to a terrain dataset in ArcGIS

DanPatterson — Fri, 05 Mar 2021 14:48:58 GMT

Project (Data Management)—ArcGIS Pro | Documentation Features

Project Raster (Data Management)—ArcGIS Pro | Documentation Rasters

To perform a vertical transformation, check the optional Vertical parameter. By default, the Vertical parameter is inactive and becomes active when the input and output coordinate systems have a vertical coordinate system (VCS) and the input feature class coordinates have z-values. Also, additional data (coordinate systems data) setup must be installed on the system.

When you select the output coordinate system, you can choose the geographic or projected coordinate system and a VCS. If the input and output VCS are different, an appropriate vertical and an optional geographic (datum) transformation are available. If a transformation should be applied in the opposite direction to its definition, choose the entry with the tilde (~) in front of the name.

Re: Help with applying Vertical coordinate transformation to a terrain dataset in ArcGIS

ErnestFonyuy — Fri, 05 Mar 2021 17:43:05 GMT

Hello DanPatterson,

Thank you for your prompt reply.

When I perform Geographic coordinate system projection using NAD_1983_StatePlane_Texas_South_Central_FIPS_4204_Feet, the horizontal coordinates are transformed to feet. Why is it that when I perform vertical Coordinate projection using NAVD88_height_(ftUS), the elevation units remain in meters and not convert to meters? Any idea why?

My thinking was that once i perform Vertical Projection , elevation values will change from meters to feet.