All Questions
874 questions
4
votes
2
answers
2k
views
Capture GDAL projection and create matching output (OGR or GDAL) shapefiles?
Working in C++, using GDAL and OGR: Depending on what the user has supplied for image input, I need to output point (or other) shapefiles in the same projection as the input raster images.
The ...
- 41
4
votes
2
answers
4k
views
Saving MapServer output to file?
How can I save the results from a MapServer file as an image? I would like to be able to write a png file as a result of a query. My query which I can display in browser is the following:
http://...
- 16.3k
4
votes
2
answers
448
views
Add image/photo as Blob to a geopandas dataframe and then save to a geopackage *.gpkg
Trying to switch from doing this through spatialite, and fully containing it within geopandas.
I have a file with the image's file locations in it, and loop through them all. Open each image and add ...
- 213
4
votes
1
answer
760
views
Add popup images to polygons
I am already having a multi polygon layer of plantations in QGIS 3.8. Now I want to see popup images of the plantations when the mouse rolls over or clicks the polygon shapefile.
I have until now ...
4
votes
1
answer
246
views
Select feature one by one and save it as image
I have used following code for selecting the features and save it as image.
layer = self.iface.activeLayer();
layer.setSelectedFeatures([])
count =layer.featureCount()
lstChalta = []
lstFeatures = ...
- 417
4
votes
1
answer
396
views
Remote Sensing Indices for urban expansion
Apart from NDBI, could you name a few indices for urban expansion? I have done some search on google but haven't found anything that could help me. Perhaps,
What I'm interested is also: road/...
- 773
4
votes
0
answers
379
views
How to increase Compression Memory for ECW Opacity Builder
I am attempting to build opacity within an ECW file using ECW_Opacity_Builder.exe from APOLLO Essential Utilities 2014, which has worked flawlessly many times before.
When attempting to build opacity ...
- 25.7k
4
votes
0
answers
756
views
How to remove black pixels in Landsat image
Does anyone know how I can remove these black pixels around the edge of this Landsat image? They appeared when I layer-stacked the bands in ERDAS IMAGINE - they were not there in the separate band ...
- 861
3
votes
5
answers
5k
views
Batch process to get single band image from stacked image using ArcGIS, ERDAS or ENVI?
Can you help me to extract a single band image from stacked multiband image. Totally, 260 image has been stacked. When I do to this, it will take a long time. So I'd like to know there is any batch ...
- 169
3
votes
2
answers
209
views
Automatically export each item in a layer as an image
I have a simple CSV file with points only. Each point represents a historical location where certain last name was mentioned in the XIX century. It looks like this:
lat;lon;last_name
55.9885461;66....
- 63
3
votes
2
answers
13k
views
Creating NDVI from multispectral imagery?
I have LISS IV image data in three bands (band4, band3 and band2). I wanted to know the required steps to obtain the NDVI image from the given data using ERDAS IMAGINE 9.2.
3
votes
1
answer
4k
views
Removing black box around georeferenced grayscale image in QGIS
I am trying to georeference a grayscale image (*.tif) in QGIS 2.2.0 Valmeria. It is working but QGIS draws a black box around the georeferenced raster image. If i use the option set 0 transparent, not ...
- 173
3
votes
3
answers
654
views
High resolution satellite
Can any one tell me from where I can buy commercial High resolution Satellite images for Biodiversity research ? I need some websites that sells these kind of images ?
- 59
3
votes
1
answer
650
views
PyQGIS: Inserting a logo image in the layout [closed]
I have a big logo image (1443 x 1453) that needs to be imported and added to the print layout. The image should be resized (to about 15% of its original size) and placed at a specific location in the ...
- 171
3
votes
1
answer
4k
views
Exporting map error from QGIS
Whenever I try to export a map as an PNG image I get the 'successfully export' message but there is no file generated. The error happened in Zanzibar so I changed to Noosa but I still can't export the ...
- 31
3
votes
2
answers
2k
views
How to drape image on surface using open source software?
I have a image with a known projection - say an aerial photo. I also have a raster surface grid with the same projection - say a DEM. Both are in the same projection. Both have the same extent.
How ...
- 462
3
votes
2
answers
335
views
Calculate an equation from two collection image
I've got stuck when I'm trying to calculate MNDISI with MODIS. FYI, to calculate MNDISI, that should use LST collection image and SR collection image, so I'm trying to combine MODIS Surface ...
3
votes
2
answers
53
views
Water color significantly different from different relative orbits?
I've been examining satellite imagery (Sentinel-2) and noticed that water can look significantly different in images from different relative orbits (seems to happen consistently for the examples below)...
- 183
3
votes
1
answer
2k
views
How to insert multiple images in the Atlas in QGIS?
I have a layer of CROSS SECTIONS (34) and the same number of IMAGES correspondent of each section. In the cross sections layer I have a column named PHOTOS where I defined this field as "ATTACHMENTS > ...
- 990
3
votes
3
answers
357
views
How to assign mean values from different windows sizes to point feature?
I have points overlaid on an elevation raster as shown below;
The aim is to get mean value of each point computed from 3x3 window size covering its immediate neighbouring pixels.
It will be ...
- 1,218
3
votes
4
answers
2k
views
Some remote sensing tutorials [closed]
I could use some tutorials on remote sensing, but some books provided they are free, would be useful.
To be specific, tutorials on ERDAS Imagine, ENVI and other remote sensing software, general ...
- 105
3
votes
1
answer
2k
views
MOD 35 Cloud Mask HDF in ENVI
I am having difficulty getting ERDAS or ENVI to correctly read and display cloud mask attributes from MOD 35 HDF files. They files are displayed as 0-255, whereas I expected some kind of code 0, 1, ...
- 91
3
votes
1
answer
207
views
Export atlas PDF failed to print images item on template
I create a template on QGIS which contains some text and images. I render the image using HTML with code:
<style>
.cropped {
position: absolute;
width: 27mm; /* width of container */
...
- 33
3
votes
1
answer
690
views
Add image in popup from json Url or image folder?
Added individual url and image for 21 places in json file.
Am trying to add image in my popup. Image shows up but broken in the popup. Not sure where in the code the error is??
(Same error for every ...
- 87
3
votes
1
answer
2k
views
Importing EXIF Metadata into attributes fields in QGIS
I use to imports JPG images with "ImportPhotos". It lacks some importants EXIF Tags such : ISO , Shutter Speed, aperture, resolution and Field of view.
There is an answer about how to import XMP ...
- 34
3
votes
1
answer
180
views
Down sample with imagemagick then import worldfile?
I'm trying to get a better understanding of the limitations of world files and how I can use them in a current project.
If I produce an ESRI world file (tfw) with listgeo:
listgeo -tfw clip.tif
...
- 491
3
votes
1
answer
364
views
Is it possible to solve Differential Equations in ArcMap and/or ERDAS Imagine?
I would like to know if it is possible to solve differential equations and run them directly in either ArcMap or ERDAS Imagine, similar to the raster calculator in ArcMap?
- 31
3
votes
1
answer
847
views
ESRI/ArcGIS draw protractor
I am using ArcGIS maps and trying to follow JS API. I am trying to understand how can I add a protractor on the map which will help in angles while drawing polygons. I understand I could add a Feature ...
- 281
3
votes
1
answer
85
views
Setting image as font filling in QGIS
Is it possible to use an image as a label font filling to have a result like in the following examples with national flags?
- 185
3
votes
1
answer
153
views
Image Resolution degrading when georeferencing
I have a scan of a historical map in pdf. I converted it in to png as well as tif and then georeferenced it. However, as soon as I load the image (both png and tif) in to the georeferencing tool the ...
- 253
3
votes
1
answer
345
views
Use high precision to convert image from one EPSG defined CRS to another
This question is based on another question: I'm converting multiple images (.jpg or .png) from one EPSG defined CRS system to another, e.g. from EPSG:31255 to EPSG:25833 (on a server within a Java app)...
- 291
3
votes
2
answers
943
views
Convert image from one EPSG defined CRS to another
I've got a lot of image files (.png or .jpg) that I want to convert from one EPSG defined CRS system to another, e.g. from EPSG:31255 to EPSG:25833, on a server within a Java app.
For each image I ...
- 291
3
votes
2
answers
403
views
How to keep the image of a collection that are integrally contained in a geometry boundary in Google Earth Engine?
I have an image collection and a geometry ROI
var ROI = ee.Geometry.Rectangle(-78.20688664502586, 34.67650023609108, -77.65207707471336, 35.216816430066366);
var l5 = ee.ImageCollection("LANDSAT/...
- 41
3
votes
2
answers
2k
views
Summing of individual image's statistic over ImageCollection Google Earth Engine
I have an ImageCollection containing FIRMS fire image in 2014. I want to count the number of fires in the year for a predefined region. I can find a way to count the number of fires for an individual ...
- 156
3
votes
1
answer
330
views
Images in my Click Info box are not appearing in both published CartoDB layers
I'm using the simple web version of CartoDB. I uploaded two datasets, each is a layer and both have the same image URL type (URLS for .png Twitter account images). When I visualise the maps ...
- 31
3
votes
1
answer
668
views
Extracting NDVI using QGIS from multiple images to Excel?
I created 25 images in QGIS.
Each image has different information about the NDVI of the area.
How can I extract mean, max, and min information about the NDVI from each image and put it in Excel?
- 41
3
votes
1
answer
2k
views
Sort colors from light red to dark red
I have the following png image displaying tanker traffic density:
The colors are from dark red to light red, dark red means 'lowest density' and light red means 'highest density'. For example, the ...
- 1,330
3
votes
2
answers
1k
views
Reduce the resolution of satellite imagery data for use in MATLAB
When I am using the 4-band multi-spectral data for NDVI calculation, after successful completion of runtime, it shows some warning message like "Loading 17%..."
How should I rectify it? Should I do ...
- 31
3
votes
5
answers
4k
views
How can I constrain my plot to the extent of the raster image?
I am currently trying to create a multi-panel plot to display six raster images (3,2) using par() and plot(raster()). When I plot the rasters though, R is displaying the Y bounds far beyond what is ...
- 31
3
votes
2
answers
11k
views
Put an image file on the map in QGIS without coordinates
Is there any way to put an image file on the map in QGIS 3.12.1 and move it anywhere. For example, there is a map with national parks and I want to add an image (SVG) as a symbol, without coordinates ...
- 43
3
votes
1
answer
296
views
White stripe when exporting QgsLayout Map to image
I have a problem when I try to export a Map in the Layout of QGIS 3 with the Python API. Here is my code :
qpt = QDomDocument()
qpt.setContent(content)
layout = QgsLayout(QgsProject().instance())
...
- 1,313
3
votes
1
answer
1k
views
Define vector projection and reproject shapefile in ERDAS IMAGINE 2013?
I come from a GIS background mainly using ArcMap and QGIS, but am now doing more image processing work and so have decided to start using ERDAS IMAGINE 2013.
I am attempting to project a shapefile ...
- 31
3
votes
2
answers
388
views
Exporting Sentinel-2A imagery from QGIS to ERDAS Imagine 2013
I have downloaded a Sentinel-2 image and loaded the 10m bands from the .xml file in QGIS which works fine. I simply want to open the image in Erdas Imagine for use in accuracy assessment in a true ...
- 321
3
votes
1
answer
1k
views
Google satellite Image_Features
What is the method to close labels and features on satellite images of Google maps?
NOTE: I don't want to use classic version of google map or use of history of google map.
What i want to remove or ...
- 191
3
votes
1
answer
912
views
Landsat 8 images acquisition_date
I need to know the exact date of image acquisition for NDVI purpose, the date on image name is " LC80920852014222LGN00" is in Julian date, but in meta data it says"acquisition_date>2014-08-10" , I ...
3
votes
1
answer
3k
views
supervised classification
I am having a problem in creating new signatures in Signature Editor in ERDAS 2014. Whenever I click on the icon (i.e., after selecting the aoi), it shows an error which says "unable to open ...
- 31
3
votes
1
answer
6k
views
OpenLayers 3 how to keep original image extent
I'm new at ol3, I'm trying to display my GIS view by updating my ol2 code.
I created the projection and I can display my static image but I'm obliged to use local extent [0, 0, 1024, 968] instead of ...
- 31
3
votes
2
answers
735
views
Which method is better for display terrain in OpenLayers? [closed]
I want to display terrain in OpenLayers.
So, I tried to use dem(.img) and convert it to dem(.jpg) on QGIS.
But, the effect is very bad.
My expected effect is (This picture is captured from google ...
- 133
3
votes
1
answer
2k
views
Georeferencing Image using saved Link Table from another Image?
I had a scanned map that I did did a georeferenced a few weeks ago and saved the link table. Now I have two more scanned map that need to do the same thing. It is the same area and one of them I did ...
- 4,139
3
votes
1
answer
2k
views
Can I edit pixels values of an image with GDAL?
There is a method with GDAL (used in C/C++) to edit pixel values of a georeferenced image, maintaining the original file? Or I have to create a new dataset? My goal is to maintain ALL originals ...
- 309