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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461 views

Performing unsupervised k means classification in QGIS? [closed]

I'm running QGIS 2.16 on Windows 10. I'm looking to perform an unsupervised K means classification on a geoTiff image I have from a multispectral camera surveying sugar cane fields. Alas, the ...
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1answer
310 views

GDAL get pixel color

Has a problem. I have an tiff image (that have 4 layers). My tasks is to make small changes in pixel's color to make image better. In this case I use GDAL library. My source is: GDALDataset *...
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1answer
2k views

Calculating Accuracy Assessment in QGIS?

Is there a way to calculate an accuracy assessment in QGIS? I have around 300 points. At each point I extracted the value of the pixel. I compared the extracted value with the value which should be ...
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0answers
295 views

4 Band JPEG2000 compression for RGBNIR

The South African National Mapping Agency acquires multispectral imagery (R,G,B and NIR)and currently compresses its aerial imagery with JPEG compression with a TIF wrapper. So we give out JPEG (Q3) ...
2
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1answer
787 views

Image disappeared after changing CRS in QGIS?

I am using QGIS 2.10.1 Why my image disappeared after changing the CRS? My procedure: Project>Project properties>CRS Enable 'on the fly' CRS transformation After I choose the desired CRS, my image ...
5
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1answer
475 views

How can I achieve high quality supervised classification?

For the supervised classification I use: QGIS, Semi-Automatic-Classification Plugin, a Landsat-8 Satallite Image and the CORINE Land Cover classes (http://uls.eionet.europa.eu/CLC2000/classes/...
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1answer
2k views

Calculating Percentage of land cover/land use images in ARCGIS [closed]

I want to ask how each land use percentage can be calculated to show water, settlements, forest, agriculture percentages. Can you suggest the process?
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1answer
317 views

Mapbox GL JS embed image in toggle menu

I would like to embed images inside of the toggle controls so that the user can use the toggle menu as a legend, how do I go about this using Mapbox GL JS? <!DOCTYPE html> <html> <...
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1answer
175 views

Annotating satellite images in the field

I have high res satellite imagery of my remote field location through Planet. I am working with indigenous communities on participant action mapping and would like to be able to annotate my images in ...
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0answers
80 views

Cutline mosaicing areal imagery with open source software [closed]

I'm very new in gis, and i'm trying to find a fast solution to merge 200 historical areal images(black and white from 1944). I orthorectified them manually, using gcp-s. They have 1 to 10 meters error....
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3answers
4k 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 ...
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1answer
957 views

Converting PNG map to polygons with colors and value using ArcGIS for Desktop?

I need to use this map (PNG file) in which each color is a population density: I've already located it using Georeferencing. Now I need to convert it to shapefile with polygons, and narrow down its ...
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0answers
132 views

QGis through python script : no map exported (map will be printed here)

I am very new to GIS in general and even more to QGis. I have a pretty simple task which is to import all shapefiles in one folder, style them and finally export them. I have wrote python code that ...
3
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1answer
184 views

QGIS QImage, can't specify a specific path

I'm a newbie in QGIS and I have to write a small python script to automate shapefile loading, applying style and save image. I'm having trouble on this last item. Here is the thing: img.save("render....
2
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2answers
3k 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 ...
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1answer
134 views

Bands disappear after Raster Calculation ArcGIS [duplicate]

I have a tif file containing 36 bands. After I applied raster calculation on the file the bands aggregate into one single band which I don't want because I need them for further calculation. People ...
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0answers
783 views

Arcmap - add an image to a legend that is not part of layer symbology

I am making a simple map, showing store locations on a background. Each store brand is displayed with an image (a coloured square with a letter e.g. Aldi might be a blue square with the letter "A" ...
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2answers
80 views

Converting an image into a font to label point features

How do you convert an image (ex: company logo) into a font and store it within arcmap so that it can be called upon to label point features with?
2
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0answers
227 views

Non-HTML circle text labels on Leaflet map

I need to save image of Leaflet map with polygon, multi-polygons, circles and text below every circle. I have geojson file with circle and polygon coordinates (lat and lng). I managed to get image of ...
2
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3answers
937 views

Convert/display grayscale image as RGB

i want to display raster images using a color palette in a leaflet map. The images are tiled (gdal2tiles) from a single .tif to multiple .png files with values from 0 to 100. I add the image using ...
2
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1answer
644 views

Load WMS into Map (Geotools)

At the Moment I try to load a WMS-Map into a Java Geotools Project. I followed every Step in the Userguide of Geotools. (here the Link: http://docs.geotools.org/latest/userguide/extension/wms/wms.html#...
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0answers
88 views

Stripes and Distortion in classification result when performing maximum likelihood classification in ArcMap [closed]

I have trouble performing a supervised classification in ArcMap 10.3. I created training areas and executed the "interactive supervised classification"-tool, which works totally fine and gives back ...
5
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4answers
503 views

ArcGIS 10.3: Insert rotated image without background

How can I insert this image into an mxd so the white background doesn't show up? I've tried using photoshop to delete the background and save it as a format that supports transparent backgrounds (gif ...
2
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2answers
493 views

Using SCP image classification to find swimming pools?

i'm currently trying to use the scp image classification plugin to find swimming pools in an aerial image. It is just an RGB image as if it had infra red this'd be a lot easier. Does anyone know how ...
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2answers
100 views

HTML ArcGIS Online inserting image issue?

Within a story map application I am trying to add a picture to the title. I am adding the picture through HTML code and it works, but for some reason it adds a maximize button to the image. This ...
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0answers
474 views

How do I make a ratio image on Erdas Imagine 2014?

I have a stacked image but want to divide bands 4/5/. I have built a model on the model maker but the resulting image is completely black after running the model. When I open the attributes table the ...
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0answers
78 views

Individual tree extraction [duplicate]

I would like to extract individual trees in ArcMap 10.1. I have 1.3 meter resolution DSM data created from aerial images. I used Crown Height Model to extract tree heights (as attached file), but I am ...
4
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1answer
9k views

Is it possible to query/download satellite images with Python?

I was wondering if there exists a Python library/API for downloading satellite images. Ideally, I would want to enter the latitude and longitude of a bounding box and get a high resolution image ...
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0answers
33 views

Orthorectify large set aerial images [duplicate]

I have a large set of images that I want to stitch the together and orthorectify. They have been taken from a small aircraft. The camera of the aircraft is tilted, thereby, although gps data is ...
3
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1answer
919 views

Openlayers 3 - georeferenced ImageStatic

I am trying to display a georeferenced image (in 4326) over a Bing map in OL3. The ImageStatic is the following. var view = new ol.View({ center: [0, 0], zoom: 15, ...
2
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1answer
54 views

Flickr image doesn't show up on Infobox Header of CartoDB?

I'm trying to put an image on my CartoDB infobox header from Flickr and it doesn't work. However, images from Google work. Is there any way to make a Flickr picture work?
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1answer
266 views

Assigning latitude and longitude to a particular pixel in satellite image

Pixel of a satellite images can be assigned latitude and longitude, but how this is done as each pixel represent certain area depending on the resolution of image that can be too high to assign ...
3
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1answer
291 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 ...
2
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1answer
887 views

Not able to add .jpg image in ArcGIS Online

I am trying to show an image in the customise popup for every feature in ArcGIS Online. For this purpose I am tring to add .jpg format image to ArcGIS Online. I believe this is an acceptable format ...
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0answers
678 views

OpenLayers add white background to image/png geoserver layer

i created a new wms layer in openlayers. i get the layer from geoserver as image/png and transparent=true. openlayers rotate the raster 30 deg (due to its coordinates - it's fine!) but add white ...
2
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1answer
515 views

Convert PNG to GeoTIFF: Invalid pixelsize in geotransform array in FME

I'm converting PNG file to GeoTIFF. Here's the setup that I use in FME: PNGRaster -> RasterExtractor -> CoordinateSystemSetter -> RasterGeoReferencer -> ...
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2answers
489 views

How can I ensure the image exported from Print Composer is accurate?

I'm using QGIS version 2.12.2, and using print composer to export my map to an image file (I've tried pdf as well). In the print composer it displays fine - just a basemap overlayed with land type ...
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1answer
45 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 ...
3
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1answer
437 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?
2
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1answer
3k views

how to show some markers on a static image using openlayers 3

I am trying to show some marker on the static image ie. Given a static image of certain size in feet and set of point in feets how mark some image or a marker on the static image using OpenLayers 3. ...
2
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3answers
2k views

View image file from hyperlink in Arcmap identify tool result

I have a file path to an image file in an attribute table, eg; C:\GIS\ScannedMaps\Map1.png When I use the identify tool on the feature I can see the file path with the hyperlink lightening symbol ...
3
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1answer
870 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 ...
2
votes
1answer
2k views

dojo/request a png image array buffer using NodeJS, and return the image to the client

I am attempting to request a png image using NodeJS and dojo/request from an ArcGIS Server REST feed, and return the image to the client. I need nodeJS to add a token to the request as a query ...
4
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1answer
234 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 = ...
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0answers
139 views

Using same ROI/Signature for classifying spatially different rasters?

Using QGIS SCP Plugin, I have classified a raster of a state. Can I use the same ROI/signatures to classify rasters of other states?
2
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2answers
702 views

Creating a mosaic from multiple Landsat scenes on Qgis

I wish to produce a large image. As a base use cloud free regions of multiple Landsat images. I wish to keep the bands and be able to work with the generated mosaic just like a "normal" Landsat image. ...
4
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1answer
2k views

Is the reflectance required to get the NDVI, for Landsat 8 images?

I'm a beginner in satellite optical imagery. I have a landsat 8 image (11 bands downloaded from http://earthexplorer.usgs.gov/) for which I need to calculate the NDVI (Normalized Difference Vegetation ...
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0answers
50 views

QGIS Uploading images or files for features

I am using a QGIS 2.12 project and I would like to know if it is possible to upload files and photos for each element in a layer. The files should be stored for example in C:\myproject\files I can't ...
3
votes
1answer
521 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 ...
1
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1answer
101 views

Problem with low quality tiff

I have the problem with low quality raster. Now it looks like this: a busy cat http://iv.pl/images/53039057684486451032.png I would like to change this to looks like this: a busy cat http://iv.pl/...

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