Questions tagged [image]

A representation or description of a scene, typically produced by an optical or electronic device, such as a camera or a scanning radiometer.

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votes
4answers
1k views

Comparing areas in scanned historical land use maps using QGIS?

I am a relative beginner to using GIS, and am running QGIS 2.0.1 in Linux. I have two historical maps which I want to analyze, that show land use patterns in the same area at two different moments in ...
1
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1answer
170 views

Clipping aerial image pairs by their overlapping area

I have a set of aerial images which I am trying to clip by their overlapping areas, for use in a more involved program I am writing. Is there a command line based tool out there with an easy method ...
8
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2answers
15k views

image segmentation of RGB image by K means clustering in python

I want to segment RGB images for land cover using k means clustering in such a fashion that the different regions of the image are marked by different colors and if possible boundaries are created ...
3
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3answers
3k views

Adding excel table to QGIS print composer?

Can anyone suggest some ideas to add a excel table to the print composer which will then be exported as a A3 png while retaining resolution. Attempted pasting in word as an enhanced meta file then ...
3
votes
1answer
1k 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 ...
1
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1answer
2k views

How to remove 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 ...
0
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2answers
126 views

Using Open Google Earth cache file in QGIS?

I have a Google Earth cache file. Is there any way to open the Google image from a cache file in QGIS 3? I had done it in standalone PC successfully. Does it works also in Mapped Network Drive also....
9
votes
5answers
25k views

Free radar (SAR) satellite data [closed]

I'm looking for free (non-commercial use) sources of radar (SAR) satellite imagery. Does anyone know of sources?
18
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1answer
30k views

Panchromatic Image association with high spatial resolution

How and Why is a Panchromatic Satellite Image associated with high spatial resolution? I googled and found that it is a single band image, but then why is it called pan-chromatic(All Colors). Does it ...
4
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2answers
5k views

Leaflet.geojson webpage performance out of hand, how to convert to .png?

I exported some countries as a single .geojson file. The file includes every country's vertices and coordinates, as that's what a .geojson is ─ a vector file. Thing is, there are about 20 countries ...
7
votes
2answers
605 views

LiDAR intensity image from multiple flight lines?

I'm working with multiple raw las tiles, and I've used Fusion to create an intensity image, but it shows the flight line overlap (see below). Any idea how can I smooth the image so that the overlap is ...
5
votes
1answer
5k views

Creating scatterplot with icons (svg or png) instead of points?

I'm just starting with R and I wanted to know if it's possible to create a scatterplot with custom icons (svg or png) instead of points. I started to import a shapefile, and then I have a set of ...
2
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1answer
2k views

How to Determine to world map size in pixel given this data?

How to Determine the world map size in pixels given this data? Map size of a particular area say, for example: Makati city, Philippines with bounds: Top-Right: 121.0281, 14.56497 Bottom-Left: 121....
8
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2answers
2k views

Georeferencing Photos With No Spatial Reference?

I have about 100-200 field ground shot photos I would like to overlay in ArcGIS 10 that have no spatial information which I need to somehow develop using a photogrammetric formula. The camera was ...
6
votes
1answer
4k views

Creating a mask with transparent pixels in Python

I have a GeoTIFF image with pixel intensities ranging between certain values. Let's say between -2 and 2 (the image is normalized). I have a certain threshold which interests me, let's sat 1. I would ...
6
votes
1answer
595 views

Automate Exporting of Rasters Using Renderer in ArcGIS

It is possible to export rasters in ArcMap by right clicking the layer-> Data-> Export: You can then click 'Use Renderer' check box to ensure the image you export uses the current symbology/rendering ...
2
votes
2answers
2k views

Adding image links in GeoJSON object to get images in popup using OpenLayers 3?

I have added a geojson file on my map. By clicking on a geojson feature I am getting a pop up which is displaying geometry and coordinate values. Now I want to display image in a pop up also. How to ...
2
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0answers
2k views

Automated testing for GIS apps

There are several commercial and opensource tools for regression automation. While many of them could be employed to test GIS apps, they fall short, at times, dealing with the unique characteristics ...
2
votes
3answers
8k views

Help displaying jpg in OpenLayers?

I am trying to overlay a jpg image over an OpenLayers map. I have been to the example on their site and looked all over for a solution with no luck. So I am guessing that their are rules for setting ...
6
votes
1answer
4k views

How to export the map in very high resolution

I made a map in QGIS. Now I want to export the resulting image (layers upon layers) for further processing in GDAL. The print composer only lets me export an image up to a fixed size. If I try to ...
4
votes
2answers
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://...
3
votes
1answer
2k views

Relative Hyperlinks in QGIS without end user's software dependency

I am trying to work out how can I add a relative path hyperlink to a shapefile in QGIS. I have found several great tips on various forums but only one has so far potential to be implemented. The ...
2
votes
1answer
1k views

Extract all unique values from a RGB raster

I have a .png file in RGB format showing the intensity of ship traffic: For my analysis I need to convert it to a one-band raster with values between 0 and 1 where 0 means lowest density and 1 means ...
2
votes
1answer
4k 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 ...
1
vote
1answer
203 views

Extracting qualified image patches in Google Earth Engine?

I want to extract qualified (e.g., cloud-free) image patches (e.g. size of 128x128) in a large image (e.g. 10000x10000) in Google Earth Engine. These image patches can overlap with other qualified ...
1
vote
1answer
578 views

Cloud cover percentage in Google Earth Engine

I'm doing a project at my university about the Cloud cover percentage in determinate areas in the world. I'm completely new to Google Earth Engine and I'm struggling a lot trying to find a solution ...
1
vote
1answer
882 views

GeoServer create map from image

Can i create a map using plain image(jpg or png) with GeoServer and OpenLayers? Scenario as i see it: I upload image(somehow) to GeoServer and it converts it to a map layer Then i create a simple ...
1
vote
1answer
42 views

Changing Dataset Property

I 'm working on GDAL C++. But I have some trouble to change GDALDataset property. I have converted "jpg" to "bmp" an image. But I want to do read an image(jpg) to gdaldataset then change dataset ...
1
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0answers
338 views

OpenLayers supported image formats

I need to display ImageLayer in OpenLayers. Which image formats are supported in OpenLayers?
1
vote
1answer
1k views

Why is azimuth resolution worse than range resolution in Sentinel1 (SAR) [duplicate]

Why is the azimuth resolution in Sentinel (SAR sensor) worse than the range resolution? The table in this link gives the resolution for SLC products aquired in the different aquisition modes. In ...
0
votes
1answer
1k views

Openlayers 3 how to get if an image loaded ol.source.Image

I'm trying to detect if an image exists or not when I try to load it. layerPrec = new ol.layer.Image({ name: "imgprec", style: 'imgprec', ...
0
votes
1answer
905 views

Earth engine error: Error: Invalid argument: 'image' must be of type Image

I'm trying to export an image for some SST temperatures for a given region ( and imported table EEZ) but I'm getting the error; Error: Invalid argument: 'image' must be of type Image Map.addLayer(...
0
votes
1answer
247 views

Georeferencing image from Google Earth?

What I want to do appears simple. However, there seems to be a bug. I have an image from GE which I want to georeference and set as a background layer. I thus set some placemarks on GE, wrote down ...