[gdal-dev] How do I merge a semi-transparent hillshade and a colour rendered DSM for better Visualization?

2023-10-26 Thread Devdatta Tengshe via gdal-dev
Hi all, My objective is to Tile a DSM in GeoTiff format, so that it can be overlayed on a OpenLayers Web Map. A common technique in Desktop GIS is to give 10% Transparency to a Hilshade and add it on top of a Colour rendered DEM. I want to do the same on the command line. I have managed to creat

Re: [gdal-dev] Tag for units in GeoTIFF

2023-10-26 Thread Even Rouault via gdal-dev
Le 26/10/2023 à 18:50, David Shean a écrit : Hi Even and Javier, For the special case of a DEM, would it make more sense to specify the units with a vertical CRS?  This approach would define the LENGTHUNIT and the associated vertical datum. Example for EPSG:4979:         AXIS["ellipsoidal h

Re: [gdal-dev] Tag for units in GeoTIFF

2023-10-26 Thread David Shean via gdal-dev
Hi Even and Javier, For the special case of a DEM, would it make more sense to specify the units with a vertical CRS? This approach would define the LENGTHUNIT and the associated vertical datum. Example for EPSG:4979: AXIS["ellipsoidal height (h)",up, ORDER[3],

Re: [gdal-dev] Tag for units in GeoTIFF

2023-10-26 Thread Javier Jimenez Shaw via gdal-dev
Thanks! On Thu, 26 Oct 2023 at 12:27, Even Rouault via gdal-dev < gdal-dev@lists.osgeo.org> wrote: > Javier, > Le 26/10/2023 à 11:59, Javier Jimenez Shaw via gdal-dev a écrit : > > Hi > > Using a GeoTIFF with a single band and float values can be very useful to > show any distribution over the te

Re: [gdal-dev] Tag for units in GeoTIFF

2023-10-26 Thread Even Rouault via gdal-dev
Javier, Le 26/10/2023 à 11:59, Javier Jimenez Shaw via gdal-dev a écrit : Hi Using a GeoTIFF with a single band and float values can be very useful to show any distribution over the terrain. One typical example is DSM (digital surface model), where the value is the elevation on every point.

[gdal-dev] Tag for units in GeoTIFF

2023-10-26 Thread Javier Jimenez Shaw via gdal-dev
Hi Using a GeoTIFF with a single band and float values can be very useful to show any distribution over the terrain. One typical example is DSM (digital surface model), where the value is the elevation on every point. Is there any standard (or accepted) metadata to say the units of those values?