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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1answer
549 views

Clipping a tiff image using another tiff image using Python

I am working on a code to clip a raster with another raster. I have a forestcover.tiff image and I want to clip it by using other image clip.tiff which extend lies within it. I don't want to use arcpy ...
2
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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 ...
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1answer
210 views

Georeference a polyygon within a pdf file [duplicate]

I have this pdf file that contains a specific borough of my city, Montreal, with a polygon inside it. Link to pdf file: PDF FILE The jpeg image once exported from the pdf file is the following I am ...
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2answers
611 views

How to add an image to canvas?

I am trying to make a QGIS plugin using Python. Right now I need way add an image to canvas but I don't want that image to be a new layer in qgis project. Is there a way to do it? Now I have: self....
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0answers
79 views

Using NDVI values as covariate in survival analyses

I am trying to become more familiar with processing NDVI values in GIS. However, despite its usefulness, it seems to have some limitations. Namely, creating NDVI values across a large scale can be ...
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0answers
62 views

Using QGIS in medical Science? [closed]

I was wondering if anybody would be interested in collaborating? My Idea is using QGIS to analyze and quantify Immunofluorescence raster images of cells from human serum.
5
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3answers
680 views

Is it possible to export my FME workbench canvas as a JPEG?

I want to print my FME workbench to a JPG so that the entire canvas is in one image. I have tried printing it to a PDF but it is trying to put it on multiple pages. I have even tried setting the ...
2
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0answers
174 views

Landsat Data to Map Slums in India

I am working on a project to answer the following geographic question: How much have slum areas increased in Mumbai, India, since the 1970's (or earliest data). I have downloaded LandSat imagery and ...
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1answer
127 views

Rendering thumbnails of a GPX track with my own tiles as base layer

I created my own Map using Tilemill. Now I'd like to display thumbnails of a GPX track where my map is the base layer. Do you have any idea how to do this performantly? I wrote a script that does it ...
1
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1answer
576 views

creating a random raster image using gdal [closed]

I want to create a random image containing say three classes with predefind percentages of each of the classes using gdal in python. Can anyone provide any sample code?
6
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1answer
587 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 ...
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1answer
2k views

How can I create GRID from IMG?

I would like to convert an img to grid in ArcMap 10.2. I tried it in two ways: In Conversion tools with the Raster to other format tool, where I adjusted the GRID format and the output workspace was ...
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1answer
1k views

Draw OpenLayers layers to Canvas

I need to export the current OpenLayers view into a canvas to finally save it as a image. My problem is, that I need an image of the current user view with some interactive elements. I saw this ...
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0answers
465 views

Scaling Images with OpenLayers

I have the same image (exactly the same dimensions) in Google Maps as in OpenStreetMap, but the scaling of the image in OSM is totally different. The scaling in Google Maps is after my opinion the ...
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2answers
2k views

Orthophoto Free Download?

I'm looking for Image datas for East Africa. Specifically for Rwanda. Does anyone know if such data are available at all free? My target is to digitize roads and buildings with the help of image datas....
2
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2answers
198 views

Cache - how to give QGIS more?

How do you increase Cache size? think QGIS is falling-over as haven't given it enough... image to export 1080 x 800 mm! Would like at least 120 dpi or 200 : )
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0answers
52 views

Raster Vector stack

I want a clipped image of NDVI for a particular area. I did raster calculation for getting the image with NDVI values. After that I tried extraction function clipper. In this function we have to use ...
3
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3answers
507 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 ?
2
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1answer
3k views

How to Read&Write .tiff images in java using GDAL library

I searched many sites to learn about this but I didn't find anything. I need step by step process for reading .tiff monochromatic image in java using Gdal library.
3
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2answers
551 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 ...
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1answer
1k views

How to add image(.jpg) to OpenLayers?

This is my website for test: http://www.cv.nctu.edu.tw/shapefile-js-openlayers/ol_simple.html My dem data is (.jpg). var inProj = new OpenLayers.Projection('EPSG:3826'); var outProj = map....
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2answers
5k views

Reading and writing tiff image and locate pixels and bands of images in R? [closed]

I am new in R. I want to know how to read and write tiff format image in R and how to use R to locate pixels and bands of images My environment is in Windows when I try to read tiff image it shows ...
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1answer
233 views

Different origin between GDAL/Python and ArcMap of a Modis image

I have a Modis image and i load this image in Python using gdal library from osgeo import gdal, ogr INPUT_raster_1 = "C:\\myimage_1km.tif" ds_1 = gdal.Open(INPUT_raster_1, gdal.GA_ReadOnly) ...
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4answers
11k views

Import Aerial Images from Google into QGIS?

QGIS 2.6.1, Windows 7 I am looking to import an image from Google Earth into an existing QGIS project. Is it possible to download geo-referenced images from google maps (or google earth) and import ...
6
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4answers
2k views

Is there a way to filter the colors out of an image?

I am using ArcGIS 10.2 to show a facility's size and position in a project area. I was not given any shape files or survey files of the area. I only have a deed (.pdf) with a B&W sketch of what ...
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0answers
1k views

How to create model maker NDBI indice using Landsat 8?

I'm having trouble making the model for NDBI (custom made in ERDAS 9.2) using Landsat 8 image? As a result of running the model I'm getting a white image.
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0answers
159 views

Is it possible to get coordinates for point from satellite image? [closed]

Is it possible to get coordination for point from satellite image using any programming language? For example, if I clicked on a specific point on a satellite image hosted on a web application, I ...
9
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2answers
1k views

Retrieving heights of buildings using remotely sensed data (except lidar)

How can I get the height values of buildings from a certain sector a city without going into the field to collect data? Is there anyway to do via satellite imagery, SRTM, ASTER GDEM or any DEM for ...
2
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3answers
88 views

Turn latlngs into image file?

I have a huge CSV file of WGS84 latitudes and longitudes, and I would like to turn these into a large image file that I can print (with each point being a pixel on the image). What is the best way ...
1
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1answer
1k views

Set coordinate origin to the top left corner

I have a BMP-picture and I know that it's top left corner has the EPSG:3068 coordinates 35500,24390. I would like to use gdal_polygonize and than calculate the EPSG:3068 coordinates of the produced ...
2
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1answer
710 views

Saving Map on Server Side as Image File

I am trying to save my openlayers map on the server, following these instructions, the sections Client-side: Tile collection and Server side: PHP: http://trac.osgeo.org/openlayers/wiki/...
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0answers
21 views

image size has been increased after i.atcorr

I have compiled i.atcorr and run for different data sets. The problem is, it is writing the output 4 times of input image. I checked for data types, they are fine. I am not able to catch where ...
2
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0answers
418 views

How to batch classify a multi-temporal raster image stack?

I am using dense time stacks of remotely sensed imagery to analyse vegetation change in the Arctic from 1984-2010 for one scene. I will be needing to classify each image, likely using the Maximum ...
2
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1answer
1k 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 ...
2
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1answer
100 views

Georeferencing an image to a Progressive JPEG

I am using the Georeferencing tool in ArcGIS 10.2 to georeference a normal JPEG image. I want to produce a georeferenced Progressive JPEG image from that image, but there is no JPEG Progressive ...
2
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1answer
990 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
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1answer
669 views

ArcGIS for Desktop is rotating attachment pictures from feature service of ArcGIS Online?

I have a web map on my ArcGIS Online account. In that map are features (line polygon points) with a picture attached to each feature. After saving the feature service as a local copy on my desktop ...
1
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1answer
283 views

Load single image by map API and draw overlays

I have an image which I want to make it zoomable and dragable in browser, and draw some overlays like lines and markers on it. So I wonder if I can use the map api like Google map or openlayers to ...
5
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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 ...
1
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1answer
1k views

Add image to bottom corner of MapBox.js map

I have a MapBox.js map up and running and I would like to add an image to the bottom left corner. I tried adding in this code: <img src="IMAGE URL" height=100 style=’position:fixed;bottom:0px;...
9
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5answers
24k 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?
1
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1answer
3k views

How to calculate degrees per pixel in a given image? Or .nth of degree?

I am trying to make very rough estimates of Lat/Long coordinates in some random parking lot images. If I visit any such random parking lot on a Google map, I can click some driving area and Google ...
1
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0answers
260 views

Stereo-pair Image Registration

Is there a simple command line or python based way to visually register a pair of overlapping stereo images and clip the non-overlapping areas out? These images do not have spatial information ...
1
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0answers
48 views

Imagine 2014 displaying images with large no-data values

I'm starting to use Imagine 2014 after a recent upgrade. The images I'm using have data values in the range of approximately -.02 to 350.0. The no-data values bordering the data has a value of 2 ...
2
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1answer
124 views

Cannot save map from composer as image or pdf

I have created a map and made a nice lay-out in the printer composer (in QGIS 2.4), the weird thing is, that if I try to save my map as an image or as a pdf immediately after entering the name in the "...
2
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1answer
1k views

Spot 6 - Reflectance calibration

I have a Spot-6 image and the metadata contain 9 values of SUN_ELEVATION (BottomRight BottomCenter BottomLeft CenterRight Center CenterLeft TopRight TopCenter TopLeft). I've used before Landsat and ...
17
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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 ...
1
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1answer
62 views

GeoTools and image storage / retrieval

Please can someone let me know how I can create a schema (using SimpleFeatureTypeBuilder()), read and write image data? Simple data types (Integer/Float etc) work fine but how do I handle image data?
0
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1answer
49 views

Georeference images together

I have taken a number of images from a very large rock overhang that contains ancient paintings. I want to piece the images together to create a single image of the entire rockshelter. Through ARCGIS ...
0
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1answer
255 views

arcmap export layer as a image with different scale

In our web application, we load too many layers cause the map loading very slow. I am thinking of export some static layers as images with different scale. There are totally 10 scales in our ...