Questions tagged [transform]

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C# GDAL spatial transformation (reprojection) always fails

I have a C# project that may load several vector data files and then needs to transform the spatial reference system (whichever used) to WGS84. I tried mostly the way described here, and also cannot ...
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Change the CRF used in a shapefile , and save the modification with Java Geotools [closed]

I want to write a function in Java using Geotools, to reproject a shapeFile in a specified CRF , and save the modification in the ShapeFile, So the input will be a shapefile using for example ESRG:...
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'Affine' object does not support item assignment (rasterio)

I would like to change the resolution of cells in the transform slot of a raster file, but it seems I cannot just do that with simple variable re-assignment. import rasterio ftdm = rasterio.open(...
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5 votes
2 answers
136 views

Flipping polygon around arbitrary axis in QGIS

I want to flip a vector polygon about an arbitrary axis. What I would like to do is select the polygon to flip, pick two points (A & B in image below) identifying the axis about which the flip ...
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Enlarging gBuffer width changes polygon shape

I am having some issues with spTransform and the gBuffer function. I basically have a polygon that I want to buffer with gBuffer (not with st_buffer for other reasons). For some reason the shapefiles ...
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Transform coordinates length to pixel length?

Is there a function to transform a coordinates length to a pixel length? I need this function for cropping and scaling map images to be inserted as layers in an OpenLayers Map. The map images are ...
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32 views

Visualize transformation when reprojecting from Mercator to equirectangular

I am trying to visualize the map distortion that occurs when reprojecting from Mercator to equirectangular coordinate systems. The actual reprojection is not difficult, but I want to save images (...
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1 answer
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How to generate ov2 poi programmatically from csv source

I'm looking at how to generate an ov2 file programmatically. Mainly I use python and I found something like this. But that kinda vague. I can't find documentation on how the file is build up. Also it ...
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80 views

GDAL coordinate transformation using C/C++ API (OGRCoordinateTransformation)

I'm in a puzzle of figuring out how to create correct coordinate transformations using GDAL C/C++ API. I have referenced code from tutorial - https://gdal.org/tutorials/osr_api_tut.html#coordinate-...
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  • 103
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1 answer
48 views

GeoTools: Geo Transform incorrect

I am transforming a coordinate between Lambert Conformal and WGS84. The values returned by GeoTools do not seem correct. From: PROJCS["unnamed", GEOGCS["Coordinate System imported ...
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2 votes
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64 views

Wrong transformation between British National Grid and WGS84

I have access to a remote DB with the following specifications: PostgreSQL 11.12 POSTGIS="2.5.2 r17328" [EXTENSION] PGSQL="110" GEOS="3.7.0-CAPI-1.11.0 673b9939" PROJ=&...
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2 votes
1 answer
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Converting latitude and longitude in a rectangle area in R?

I'm really struggling in how can I transform my lat and lon coordinates of my dataframe in x and y (Euclidean coordinates), where the x-axis should vary between 0 and 10. Here is my data: library(...
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1 answer
148 views

Affine transformation: rescaling alters the raster bounds?

I'm trying to rotate a raster around its center coordinates, rescaling the resolution by a factor. I expect the transformation to conserve the center pivot. However; it seems that after the rotation ...
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37 views

Orientation Conversion: ECEF YPR (321) to LTP Tait-Bryan angles

I am looking for guidance to convert ECEF orientation (Yaw/Pitch/Roll 3-2-1) to the corresponding LTP (NED/ENU) Tait-Bryan angles. There are several excellent resources to convert position between ...
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1 vote
1 answer
167 views

"ValueError: negative dimensions are not allowed" when using raster created from points in CSV

My problem is similar to "ValueError: negative dimensions are not allowed" when using raster created from NetCDF I am working on a raster that I generated from the interpolation of some ...
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1 vote
1 answer
235 views

EPSG:3857 units are in meters, why is ST_Distance showing distant locations to be less than a meter apart?

According to Google, these two points are about 137 meters apart, yet the result of ST_Distance reports just a fraction of a meter? The units of the result should be in meters, as I understand it, ...
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How to reproject without shifting image?

Reprojecting an image shifts it by about 200m. I think this is because the reprojection changes the transform if I specify the scale. I am hoping to change the resolution of the image (e.g. to a ...
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3 votes
0 answers
875 views

QGIS: No transform available error

I installed QGIS 3.16 on Ubuntu-20.04. Details on 'About QGIS': QGIS version 3.16.12-Hannover QGIS code revision be6cb030ac Compiled against Qt 5.12.8 Running against Qt 5.12.8 Compiled against ...
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1 vote
1 answer
163 views

geometry.transform() removes the drawn feature in OpenLayers

I have a simple OL-based map with the default EPSG:3857 projection and an interaction which lets me draw a LineString on the map. Then, I have an event listener registered on the VectorSource, which ...
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31 views

Applying the same transformation to a Raster as a Point Cloud

I am using PDAL filter.transformation to apply the same transformation to all my point clouds. pdal pipeline example: [ "untransformed.las", { "type":"filters....
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3 votes
2 answers
259 views

Array for_each in QGIS

Is there an expression in QGIS for array for_each to get the element from the output of geom_to_wkt($geometry) of the polygon and correspondingly transform the element (using the expression of LAT ...
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0 votes
2 answers
244 views

Type error for gdal- GDAL-style transforms have been deprecated

I'm trying to export numpy ndarray that I have to TIFF using rasterio. I have the transform of the image: print(transf) >>>(583932.1992386435, 10.0, 0, 2223772.1491772938, 0, -10.0) When I ...
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