Questions tagged [affine-transformation]

An affine transformation is a 2-dimension cartesian transformation applied to both vector and raster data, which can rotate, shift, scale (even applying different factors on each axis) and skew geometries.

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33 views

Shapely affine transformations with bounds of GeoDataFrame

I understand that I can use Shapely's affinity.translate to translate a geometry like the below: from shapely import affinity from shapely.geometry import Polygon poly = Polygon([(0, 0), (1, 0), (1, ...
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47 views

How to calculate affine transformation by Python gdal as same as gdal_translate?

I've made a python script which tries to reproduce what gdal_translate does (given a bounding box BBOX in EPSG:4326 and an UTM32 .jp2 file. Then, translates the BBOX from EPSG:4326 to EPSG:32632 (...
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PyQGIS: Set coordinate transformation for non-referenced raster

I need to add raster layer to a project. Image is PNG and it doesn't have georeferencing. So as far as i know, i need to setCrs (Coordinate Reference System) of the layer, and setup extent of raster. ...
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Difference results from QGIS project on fly and gdalwarp for EPSG:4326 of Sentinel 2 UTM zone 32?

I always thought QGIS and gdalwarp should return same result for projecting a 2D Sentinel 2 image (e.g: T32UQD_20200421T102021_TCI_60m.jp2) from UTM 32 to EPSG:4326. What I did was: Open the .jp2 in ...
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Multiplying/dividing x/y values of line and polygon layer vertices?

I have several polygon and line layers in shapefile format with no crs so it can't be reprojected. The vertices coordinates need to be divided by 3,600,000 in order for them to match the project crs, ...
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0answers
21 views

Raster shapes are not exactly equal after cropping

I clipped multiple rasters to the shape of a polygon shapefile. But, the output rasters do not have exactly the same shapes. I am doing correlation analyses per pixel so I need the array shapes to ...
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1answer
43 views

Creating Affine for 2D Linear Transformation of Fixed Bounding Box

I am currently trying to create an Affine which can transform data from longitude and latitude to a custom CRS that a client is using. Unfortunately the person who originally made this CRS has left ...
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1answer
37 views

Transforming / stretching map or it's part in particular direction

I am trying to model ancient land surfaces we can 'rollback' geological folding and faulting. This is called palinspastic modelling or mapping. So I have an area that due to folding and faulting was ...
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1answer
76 views

Defining rotated CRS with WKT

I am trying to figure out how to display a rotated grid correctly with GeoServer with using the affine transformation in WKT as described here: Defining coordinate reference system with rotation in ...
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1answer
188 views

Defining a coordinate system in WKT or PROJ format that has an Affine transformaiton and bounds

I need to define a local coordinate system via OGC WKT or PROJ form. I know they have implemented Affine transformations in Proj 5 but I am unsure of how to implement it. The base projection is from ...
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1answer
219 views

Which affine format to use in Rasterstats zonal_stats?

I am working with the Rasterstats package to run zonal statistics on two raster datasets. The documentation calls for the following: import rasterio from rasterstats import zonal_stats with rasterio....
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106 views

Reprojection problem with Rasterio

I have already processed so far NDSI map by using Rrasterio, NumPy, os and matplotlib.pyplot for plotting the data. Now, I would like to eliminate permanent ice from NDSI map. I am facing one major ...
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1answer
32 views

Controling affine transform of raster in ArcGIS Pro

I have a png file which I created from a field equation. I need to plot that on my map. I am plotting it on a map with Coordinate System being GCS WGS 1984 (EPSG: 4326). Since it is not georeferenced,...
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2answers
68 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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2answers
301 views

Performing Vector Affine Transformation using QGIS?

Due to an incorrect datum coordinates, I need to move a large number of elements in shapefiles by a specific distance. In 2.8 I would have used the Affine Transformation tool, but this does not appear ...
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67 views

Calculate transform from oblique raster, shape and CRS

Given a simple jpg of an oblique aerial photography, the geometry and a CRS I am trying to determine its affine transform so I can convert it into a GeoTIFF. import rasterio, rasterio.crs raster = ...
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1answer
85 views

Converting coordinates from a local coordinate reference system

I am trying to define a local CRS in R based on the information in the screenshot image below My R code is as follows: I define the local CRS from the screenshot image I apply it to my dummy ...
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110 views

Non-Earth System in QGIS?

What I need is a function for Non Earth Coordinates in QGIS (both projects and layers). They should be mappable to any projected coordinate system (like SWEREF99TM). Why: In the Mining industry we ...
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1answer
146 views

How to transform a shapefile with a MN03 (LV03) coordinate system into a shapefile with a MN95 (LV95) coordinate system?

Switzerland is currently introducing new coordinates: by the end of 2016, all federal and cantonal reference data (e.g. the Swiss cadastral system) sould be transformed to the new highly-accurate LV95 ...
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1answer
1k views

Transform coordinates from custom projection to lat long PyProj

I am trying to convert a pair of coordinates specified in US survey feet on a custom transverse mercator projection to lat/long using PyProj. I must be doing something wrong because I cannot get the ...
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2answers
580 views

How to create proj4 definition of local coordinatesystem

i have to generate a proj4 definition string from affine transformation parameters (A-F). For example: I have a local coordinatesystem based on EPSG:31466 The affine parameter are: A = 0....
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1answer
959 views

Using shapely.affinity and affine_transform?

I have shapely.geometry Point: from shapely.geometry import Point point1 = Point(0, 100, 200) and I want to swap coordinates Y and Z: from shapely.affinity import affine_transform matrix = [1,0,0, ...
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1answer
321 views

Local coordinate system to EPSG via affine transformation

I have a raster file with a local coordinate system. It is based on EPSG:31466 but with a specific rotation and offset. gdalinfo output is this: I need to transform this gtiff back to 31466, but how?...
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Why can't I transpose a raster across the pole with rasterio or gdal, and how could it be done?

I have a raster in e.g epsg:4326, it covers all world, from 180E to 180W, from 90S to 90N. I want to re-project a part of it to epsg:3031 and also change the grid size and resolution. Here is a ...
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129 views

Spatial Adjustment of shapefile not possible

I am trying to spatially adjust a shapefile containing several polygons to another shapefiles where spatial data is correct. Both should share exactly the same extent. However, when I am using spatial ...
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0answers
65 views

Reprojecting trouble: shapes saved in one EPSG load as another EPSG in QGIS and are 200m off?

I'm in a mixed working environment with some ESRI licenses and several people working with QGIS. For a project, we created data and received data in EPSG 31468 (Gauß-Krüger Zone 4). We now need to ...
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370 views

Import Illustrator/Inkscape svg into qgis

I tried to import lines from svg into qgis 3.x by using dxf format. The problem is that the scale of dxf is of course not the right one (a few centimeters whereas my map is kilometers long). I tried ...
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44 views

Affine transformation of different sized polygons layer to equal area units

I would like to transform a layer of polygons of different sizearea to become equal in areasize. I have QGIS 2.18 and GRASS GIS 7 available and some basic Python knowledge. Does anyone have an idea of ...
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1answer
4k views

Enlarge a Polygon without changing its shape or position

I have a single polygon shapefile (EPSG: 3044) which I want to enlarge using QGIS 2.18.16. I tried to use the vector affine transformation plugin, but whenever I try to change the size of the polygon,...
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453 views

Raster alignment

I have a problem with raster aligning. Given: Two rasters that need to be aligned. Rasters a little bit shifted, scaled and rotated. Two arrays of matched keypoints. Transformation is wrong, so ...
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1answer
563 views

Transformation of geometry on select Postgresql

I am trying to run a transformation of a geom via a select query, the layer has been digitised in WGS 4326 and when I run my select to filter the table by my criteria, I would like to transform the ...
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195 views

Weather data in rotating grid without time dimension or vertical dimension or CRS

I am a beginner using QGIS 2.18.15. I am having some trouble to find the right coordinate reference system for wind speed data of Europe from the German Weather forecast service (DWD). (ftp://ftp-...
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0answers
134 views

QGIS custom CRS from Mapinfo definition

How do I define a custom CRS in QGIS from the Mapinfo grid definition below? "MIM Grid",1008,33,7,139.48639389,-20.69008981, 1.000063,0,0,7,0.998796124,-0.049054077,12520.6,0.049054077,0.998796124,...
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178 views

What can the GeoTransform parameters tell me about an incorrectly georeferenced map?

I have two GeoPDF maps of the same area published a few years apart. There are only minor updates so virtually identical. However the newest map appears to be incorrectly georeferenced. I ascertained ...
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90 views

Define Custom CRS for working with SVG

I can't seem to figure out a way to define a custom PROJ4 projection that can mirror geometries (e.g. inverse x to -x and y to -y and vice versa). Other than that, I don't need any transformations or ...
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1answer
3k views

Spatial adjustment of vector data in QGIS? [duplicate]

Is there any plugin or code reference available to spatially adjust vector data based on points selection like in the Spatial Adjustment tool of ArcGIS Desktop? I am trying to develop spatial ...
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1answer
756 views

Calculating Affine Transformation in QGIS?

I have points taken with a Total Station, but the azimuth was set incorrectly so the map is rotated. I have a reference file with common points and in the correct orientation. Both data sets are WGS84 ...
2
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1answer
289 views

Generating world files for a set of non-georeferenced rasters using QGIS?

I have a set of topographic sheets in a form of non-georeferenced *.bmp rasters, and a shapefile representing footprints of those topographic sheets. What I need to do is to using corresponding ...
2
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1answer
1k views

Using vector affine transformation in QGIS?

I'm trying to use the QGIS plugin vector affine transformation to translate a shapefile with wrong coordinates using the right coordinates of another shapefile. It looks like this I read other ...
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0answers
321 views

Moving and Rotating Raster Files in QGIS Individually?

I would like to overlap 2 raster files(.JP2/ECW) where images are captured from the same place but just with a little time difference. When I try to overlap the images by moving and rotating, QGIS ...
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2answers
2k views

Transforming data from a rotated pole lat-lon grid into regular lat-lon coordinates in QGIS?

I am working with data from a numerical weather model, the output of which is given in grid cells where I have the lat-lon coordinates of each cell's center point. The lat-lon specifications are, ...
4
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1answer
331 views

Apply affine transformation to multiple layers

I have many shapefiles representing the layers of a map (roads, buildings, etc). In total, I have hundred of layers, and I want to scale all of them by the same factor. I know I can use the affine ...
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1answer
278 views

Georeferencing images

I have a lot of radar images that come with image coordinates (824x648). The projection should be Austria Lambert/ETRS89 (EPSG: 3416). So to perform the georeferencing I need to convert ROW/COL to ...
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49 views

Adding Raster to ImageServer: What are the Geodata Transformation Parameters?

I'm trying to add a raster image to an Image Service, via the Add Raster operation. My original image file is accompanied by a world file, containing the six parameters of an affine transformation. I ...
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2answers
194 views

2D affine conversion's coefficients

I would like to calculate coefficients of a 2D affine conversion between two images. Let me know of online pages that can help make programs using C or C++ or provide an application. I need a program ...
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3answers
269 views

Determining coordinates of a SHP file

i have a SHP file of a building converted from a DXF file. This SHP file is unprojected and have no specific coordinates (origin 0,0). I find WGS84 coordinates (lat, long) of this building from Google ...
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0answers
1k views

Transformation from local projection to WGS84

I'd like to reproject point that is in local coordinate system to the WGS84, using gdal. But exception "No PROJ.4 translation for source SRS, coordinate transformation initialization has failed" ...
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1answer
4k views

Convert longitude/latitude to pixels on the map

I have a map from here. I want to be able to simply convert arbitrary lon/lat pair to pixels on the map (also the ability to do reverse conversion). The maps come with .tfw file and projection info, ...
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0answers
369 views

Storing non-orthorectified images in GeoTIFF

I'm reading GeoTIFF and GDAL documentations and I'm trying to understand what type of transformations are supported. GeoTIFF documentation says you can use ModelTransformationTag to define a ...
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0answers
2k views

How to scale, rotate and translate a KMZ file in Google Earth

I'm a GIS software developer. I would like to adjust manually a KMZ over Google Earth images scaling, shifting and rotating it. What I'm wondering is a tool like the one in Google Earth to add a ...