Questions tagged [transform]

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Read GeoJSON object in a CSV file column and transform it to geometry

I have a column ('geo_shape') that contains GeoJSON object type of linestring geometry and, so far, I didn't manage to read and transform it to a GeoPandas/shapefile type of geometry. Here is a way ...
SKSLH's user avatar
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How can I use code to get accurate "crs_transform" of ee.Images after the clip() operation?

I use GEE(Google Earth Engine) for my research. I found that the parameters "crs_transform" of the ee.Image did not change before and after the clip() operation. print(ee.Image('LANDSAT/LC08/...
he lirong's user avatar
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Discrepancy In PostGIS Transformation: 103761 to 900913 to 4326 vs 103761 to 4326

Overview I'm using PostGIS 3.1 on PostgreSQL 12.14 and I'm facing an issue with GIS data transformation and I need some assistance in understanding the cause of a significant discrepancy between two ...
jBit's user avatar
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Reproject and resample raster1 to CRS and grid of raster2, but keeping the shape of the original raster

I am working with two raster files. path_target: shape (27502, 6133); CRS: EPSG 31255 wk_path: shape (294825, 570431); CRS: EPSG 31287 I would like to reproject path_target to EPSG 31287 and align the ...
KevinKo's user avatar
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Create pandas DataFrame from raster image - one row per pixel with bands as columns, preserving coordinates [duplicate]

I have a 37 band image that I hoping to transform so that each row is a pixel and each column a band. I am following what was suggested in this post: Create pandas DataFrame from raster image - one ...
Greta Martin's user avatar
4 votes
1 answer

QgsCoordinateTransform causes crash in processing script

I want to perform a QgsCoordinateTransform on a QgsGeometry object and do some operations on this afterwards. I am doing this in a processing script and am getting the original QgsGeometry object from ...
MrXsquared's user avatar
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I am trying to convert 3D world coordinate to a 2D image coordinate in the form of pixels

I have a GeoTIFF file. I am trying to convert 3D world coordinate to a 2D image coordinate in the form of pixels. How can I do that? Suppose, I can extract latitude, longitude and elevation data from ...
keeponlearning101's user avatar
4 votes
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How to reduce the clothesline-effect in ST_Transform?

When we use standard ST_Transform (e.g. PostGIS implementation), from a SRID to another that curves straight lines, the original straight lines represented by two points, that must be transformed into ...
Peter Krauss's user avatar
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1 vote
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How may one convert from Lo.22/18 Prelim. to Schwarzeck / Lo22/17: EPSG29377?

I am currently georeferencing an archival map with a set of coordinates from a Documents. Some of the coordinates are given in Schwarzeck / Lo22/17, the other points however are given in Lo22/18, a ...
I Love Mapping So Much's user avatar
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How to convert WGS84 to NAD27 in pygeodesy?

Using PROJ, this command will convert / reproject / transform a WGS84 latlon point to NAD27 CONUS, UTM zone 11: cs2cs.exe +proj=latlong +init=EPSG:4326 +to +init=EPSG:26711 -120 39 240281.39 ...
Tom Grundy's user avatar
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st_transform does not work

I am trying to transform a geometry from srid 4326 to 26915. SELECT ST_Transform(s.geompos, 26915) FROM sites s But i got error : ERROR: could not form projection (LWPROJ) from 'srid=4326' to 'srid=...
عبد القادر كعوان's user avatar
2 votes
1 answer

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 ...
BAGZZlash's user avatar
1 vote
1 answer

'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 =
hmnoidk's user avatar
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5 votes
2 answers

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 ...
cm1's user avatar
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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 ...
Lydia's user avatar
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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 ...
Suka's user avatar
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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 (...
EvoBio721's user avatar
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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 ...
botenvouwer's user avatar
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1 answer

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 -
arapEST's user avatar
  • 103
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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 ...
Chad Johnson's user avatar
3 votes
1 answer

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=&...
GStav's user avatar
  • 309
2 votes
1 answer

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(...
Ga13's user avatar
  • 145
1 vote
1 answer

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 ...
WaterFox's user avatar
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1 vote
1 answer

"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 ...
dncardenasg's user avatar
2 votes
1 answer

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, ...
vaer-k's user avatar
  • 173
7 votes
1 answer

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 ...
HY K's user avatar
  • 71
1 vote
1 answer

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 ...
BaldWin03's user avatar
3 votes
2 answers

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 ...
ROEL SANTIAGO's user avatar
0 votes
2 answers

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 ...
ReutKeller's user avatar
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