Questions tagged [vertical-transformation]

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Vertical Datum transformation for raster using ArcGIS Pro

I have a DEM raster file on WGS84 CRS and height referenced to ellipsoid on same datum. I want to convert that DEM to local CRS (horizontal & vertical) including the vertical datum transformation. ...
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Does changing the Vertical Coordinate System of a LAS file changes the actual height/elevation values?

I would like to know should/does the original height values get updated if I change the vertical coordinate system. I already have the las dataset in WGS 1984 Now, I used the Extract LAS ...
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Vertical datum transformation in ArcGIS Pro

I'd like to compare USGS 3DEP DEM with SRTM DEM for western U.S.. I did some research here, and find out that I need to match their datum (from NAD83-NAVD 88 to WGS84-EGM 96) before comparing the ...
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Ellipsoidal to Orthometric Height Conversion

I have two DSM, one generated using lidar data in NAVD88 and the other I produced using stereo images in WGS84 G1150. I am trying to covert G1150 to NAVD88. I have tried a few conversion tools, ...
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vDatum returns error at Linux command line - fails to accept parameters with GUI

I am trying convert a GeoTiff using VDatum at the Linux command line. My data reference the Washington State Plane South CRS with z values referencing EGM96. I would like to convert these z values to ...
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Vertical datum conversion in ArcGIS Pro not recognizing vertical coordinate system

I have a GeoTiff surface model and the z values reference EGM96. I would like to use the vertical datum conversion capabilities in ArcGIS Pro 2.7 to convert the GeoTiff to reference the NAVD88 ...
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Identifying undefined vertical datum

I was given two DEM files covering the same area of Northern California (lets call them File_A and File_B). They're derived from LiDAR that was flown separately in the last 10 years. My goal ...
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How to transform ERA5 vertical datum to WGS84

I am trying to plot a netcdf file from ECMWF ERA5 in a folium map but I am having troubles with the projections in the file. ECMWF documentation states: ECMWF data is referenced in the horizontal with ...
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2 votes
1 answer
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PostGIS ST_Transform seems to treat the vertical datum but not the equivalent pyproj Transformer, even so they both rely on Proj

I've narrowed down a problem I met when processing some points having altitude values to the following: It seems that PostGIS and pyproj do not treat the vertical datum in the same way but both are ...
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3 votes
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Specifying geoid grid for osr.SpatialReference instance

How can I specify e.g. Geoid 12A or Geoid 18 when (for example) converting NAVD88 orthometric heights to ellipsoid heights using the OSR Python bindings? I would like to be able to specify any .gtx ...
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ArcGIS automatically converting Z units when no Vertical CRS is defined

I have seen this on several tools, but it was most obvious to me when using calculate geometry in the attribute table. I have a point dataset that has Z values, but no VCS defined. I then used ...
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Workflow in ArcGIS Pro for WGS84 EMG2008 to NAVD88 Elevations

Can someone walk me through their workflow to obtain NAVD88 elevations in ArcGIS Pro starting with WGS84 elevations (EGM2008 ellipsoid for heights)? It would have to be something like the below, but ...
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Convert heights from DHDN Gauß Krüger Zone 4 to UTM 32 ETRS 89 in pyproj

I am using pyproj. X/Y conversion is pretty straightforward through transformer = Transformer.from_crs(31468, 25832,always_xy=True) However, this does not transform the heights. From Vertical ...
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2 votes
1 answer
337 views

Gravity related height from ellipsoidal height using pyproj

I'm using the pyproj library (http://pyproj4.github.io/pyproj/stable/index.html) to get translate ellipsoidal heights into gravity related height. Code: from pyproj import CRS from pyproj import ...
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5 votes
2 answers
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Vertical Datum transformation using Pyproj

I have been using Pyproj for some time now doing only simple projection and transformation. I am totally new to vertical datum and differences in GEOID among Coordinate systems. I have been trying to ...
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2 votes
2 answers
289 views

is there a way to manually stretch a polygon?

I have this polygon that I want to manually fit and resize(without entering affine numbers, just resizing it with my mouse). Is there a way to do it?
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3 votes
1 answer
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What XY coordinate system goes with EGM96 when projecting elevation raster in ArcGIS Pro?

I am using ArcGIS Pro 2.3.1. I have an elevation raster in WGS84 and a national Z coordinate system. I need to project this DEM raster to the EGM96 Z coordinate system. Which XY coordinate system ...
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1 answer
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Converting the vertical datum of elevation data in R

I have elevation data for 699 points around Australia. I want to calculate the difference between these point elevations and the highest elevation within 25 nautical miles - in simple terms I want to ...
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2 votes
2 answers
189 views

Height transformation parameters between any model and EGM-96

Dear Mr/Mrs Geodesy Engineers I have a quite deep question here, AIP data locations are determined by geographic coordinates /X & Y axis/ and vertical values /Z axis/ via Geodesy science. ICAO ...
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4 votes
1 answer
215 views

Using NAVD88 geoid in Northern Canada?

The USGS NED (1-arcsec) dataset is available for the continental US as well as most of Canada. It is based on the NAVD88 vertical datum. I am interested in using the DEM to orthorectify SAR scenes in ...
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2 votes
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Sentinel 1 (A and B) Vertical Datum

I have been working through the ASF's "Recipes" for the creation of a DSM from Sentinel 1 (A and B) imagery. I am able to produce a DSM, and am relatively happy with the results in terms of the ...
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4 votes
1 answer
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Specifying geoid in ArcGIS Raster Project tool?

Background: ArcGIS Desktop 10.6, Spatial Analyst I have two bare-earth DEMs, derived from lidar, acquired on different dates. I need to subtract one DEM from the other as part of a stream erosion ...
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  • 7,059
1 vote
1 answer
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Trimble 7X GNSS point Z returns negative elevations

I have a newly acquired Trimble 7X (with a centimeter kit). I collected a point in an area with a clear view of the sky. The accuracy indicator showed 1" accuracy and post processing and a ...
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3 votes
2 answers
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Converting vertical datum from WGS84 to EGM96 in ArcGIS Desktop?

I am comparing two different Digital Elevation Models SRTM (Datum: EGM96) Cartosat (Datum: WGS84) How to convert WGS84 to EGM96 in ArcGIS Desktop?
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4 votes
1 answer
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Analyze the extent of a NTv2 grid

I am using a NTv2-grid for transformation of geodata. The grid can be found here: gsb-file: https://www.lgl-bw.de/lgl-internet/web/sites/default/de/05_Geoinformation/Galerien/Dokumente/BWTA2017.zip ...
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2 votes
0 answers
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Completing Coordinate transformation?

I have two airborne lidar datasets and, for purposes of comparing change between the two, would like to standardize the vertical and horizontal coordinate information for each. The plan is to ...
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1 vote
1 answer
306 views

dxf rotation and georeference [duplicate]

I have a DXF (layout) which is to be spatially adjusted to a point shapefile that has correct X Y cords. When I add both as vector layers to Qgis, point shapefile is right on place but dxf shows a ...
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3 votes
0 answers
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NOAA vDatum which WGS84(*) reference for data created using ESRI WGS 84 [closed]

I have an ESRI shapefile that use the WGS84 using latitude and longitude. The ESRI text for this coordinate reference system refers to EPSG 4326. The Z values reference the NAVD88 vertical datum and ...
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2 votes
2 answers
5k views

Convert Geoid File Types

Anyone know what I can use to convert a geoid surface stored as , BYN into .GTX for use with PROJ4? The CCG2013A vertical datum and geoid model from NRCan is only available, as far as I can find, in ...
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1 vote
1 answer
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What vertical datum for OpenDroneMap with no GCP

I am processing drone imagery with OpenDroneMap using a native Ubuntu installation of OpenDroneMap. I see the the LAS generated returns points in UTM for X and Y coordinates as stated in the ...
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1 vote
2 answers
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NOAA vdatum GDAL Variable Paths for Linux Ubuntu

I want to do vertical datum conversions on geotiffs using NOAA vdatum The conversion status menu shows no progress and no conversion happens. I see that Microsoft Windows needs GDAL environmental ...
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0 votes
1 answer
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Procedure for converting NAD83 to NAD83 1992 epoch (1991.35)?

I am attempting to convert a shapefile from NAD83 HARN / egm96 vertical to NAD83 1992 epoch (1991.35) / NAVD 88 vertical. I have attempted to use NADCON to no avail. I know I can use the Define ...
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1 vote
0 answers
254 views

Converting vertical coordinate system of LAS dataset? [duplicate]

I want to overlap both LiDAR data and SRTM data but they use different vertical coordinate systems. I am using ArcMap 10.2 and I firstly created a LAS dataset and original vertical coordinate system ...
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7 votes
1 answer
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Vertical Datum and Projection

Does vertical datum get projected? I feel a bit confused with the concept of the vertical datum and doing a projection.
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3 votes
1 answer
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NED (NAVD88) to WGS84 heights

I need to convert the 1/3 arc second DEM files from the NED into WGS84 ellipsoid heights. The documentation says that the NED is referenced to NAVD88. I've tried using gdalwarp as follows: gdalwarp ...
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  • 171
11 votes
5 answers
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Vertical Datum conversion of a raster with gdal

Is there a tool available in gdal to do vertical datum conversion of a raster DEM? I'm looking for a single command line to execute the vertical datum conversion of a raster like the las2las of Liblas ...
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3 votes
1 answer
531 views

VDatum helmert transform parameters

I'm trying to use NOAA's VDatum to verify the NAVD88 -> WGS84 datum conversion in a c++ datum conversion library that I've written. The answers didn't agree, so I attempted to check a simple ITRF2008 ...
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0 votes
1 answer
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Combining two z values with same x and y in ArcMap?

I have a point file with elevation values I want to combine with a raster of the same area. I'm assuming I will need to extract points from the raster to store as a .shp file. Then I need to combine ...
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  • 191
6 votes
3 answers
441 views

Vertical datum query for coastal modeling

I have a USGS derived DEM with a vertical datum of EGM96 from NASA satellite data. My Bathymetry uses a lowest astronomical tide datum. Has anybody come across this or similar issue before? I need ...
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  • 191
7 votes
1 answer
2k views

Canadian Geodetic Vertical Datum of 2013 (CGVD2013)

"Natural Resources Canada (NRCan) has released the Canadian Geodetic Vertical Datum of 2013 (CGVD2013), which is now the new reference standard for heights across Canada. This new height reference ...
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5 votes
1 answer
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Can GDAL Perform Vertical Transformations?

Can GDAL perform vertical transformations? If the answer is yes, please indicate which amongst these listed pages can explain how exactly to accomplish vertical transformations? If there is some ...
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2 votes
0 answers
515 views

How do you compute vertical transformations in QGIS?

How do you compute vertical transformations in QGIS? Ideally, the procedure / plugin will allow the loading of sundry geoid models.
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8 votes
4 answers
4k views

Vertical Datum Conversion Utilities

I have some data (points and rasters) that I would like to be able to convert to and from several vertical datums, including MLLW in coastal Florida. I would appreciate it if people could provide some ...
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