Raster is a data format consisting of regular grids of values, usually stored in an image-like format.

learn more… | top users | synonyms (1)

1
vote
1answer
54 views

Unexpected output when using gdal_rasterize

Ok, I used the following code for converting my layer into raster format but I get a tif file that is completely black or white... from osgeo import gdal, ogr # Define pixel_size and NoData value ...
0
votes
0answers
41 views

Why does merge/mosaic four DEMs into one give ERROR 01042?

I'm unable to merge 4 dems into one using ArcGIS Home 10.2. Raster Calculator, adding them, gives me the error: RuntimeError: ERROR 010422: Error in processing the environment mask. I created a ...
0
votes
3answers
49 views

Colorizing raster in QGIS 2.2 without using OSGeo4W command line?

Total beginner in QGIS. Following this guide right now: https://www.e-education.psu.edu/geog585/node/695 At step 4 I created the simple txt file which I now need to use to colorize the raster ...
2
votes
0answers
22 views

In R, set NA cells in one raster where another raster has values

I have two rasters in R. I want to set values to NA in the first raster where the second raster has values. I think this should be simple, using the raster package, with two RasterLayer objects ...
0
votes
1answer
92 views

How to compare two rasters and reclass the greater value(python script)?

I am working on an assignment that requires us to reclass a raster(via python) from two rasters. We need to compare the power received at one cell(on raster1) and compare it to the same cell on raster ...
0
votes
0answers
22 views

Is the “1-band raster colour table” plugin available in QGis 2.0?

I used to use the "1-band raster colour table". Is it still available in QGIS 2.2.0? It seems like I can't install it (I don't find it in the list of plugins available, even after installing the BC ...
0
votes
0answers
33 views

How to crop an image into more than 80 small sections automatically in R

I'd like to crop an image into 15 sections in R. The image projection is Geog lat/long, extending 87 to 120 degree in East and 45 to 55 degree in North. I want to separate it by every 2 degree. So I ...
0
votes
0answers
57 views

Opening netcdf in arcmap as a raster with uneven coordinate spacing?

I have SMOS CATDS 2010-2013 daily data that is in EASE-grid netcdf format. I have 100 sites that I need specific daily soil moisture values for from this dataset. I have daily AAFC CATDS soil ...
0
votes
0answers
22 views

Display one of many rasters in Web Map

I would like to interactively add a georeferenced tif to my webmap. Use case is: I have a raster catalog of georeferenced tax maps. I would like to be able to select those tax maps (there are ...
0
votes
1answer
13 views

upload data to geoserver with gxp upload panel

I installed geoserver in my computer. I use wampserver (php, apache), and when i use the examble "layer-upload.html" then i have the erro 405: Failed to load resource: the server responded with a ...
0
votes
0answers
27 views

Regression analysis - creating dataset

I have a vector-based dataset of soils/parent material. The statistics have already been done, with coefficients for each category of parent material. I am not sure how to use this information to ...
0
votes
0answers
31 views

Raster projection problems

How would I go about specifying the following projection in Arc and QGIS? After defining this, how would I then go about changing the spatial reference to ESPG 27700? The following are the details of ...
0
votes
1answer
62 views

Import raster into PostGIS using Python

I am trying to import information from a Bathymetric Attributed Grid (BAG) file into PostGIS using Python and psycopg2. I'm working, for now, on a Windows box with pre-compiled packages, so I don't ...
0
votes
1answer
86 views

Calculating percentiles of a raster (TRMM DATA)

I have a set of raster (floating point) i.e A daily rainfall intensity data for a year, now i need to select and group these raster in to various percentile categories, Above 90th percentile, 50-90, ...
3
votes
2answers
123 views

TIF format to view a vegetation Map with QGIS

I'm a new user of QGIS and I'm trying to view a map present in an online GIS dataset. There are several formats for this dataset and one of them is a TIF folder with several files: .tif, .tif.aux, ...
1
vote
1answer
117 views

ArcGIS 10.1 Remove (or SetNull) areas of overlapping rasters

I have one raster layer that is a site suitability layer for a county. Then I have two feature classes (one for roads and one for hydrology) that I need to remove or just set to Null from the site ...
1
vote
1answer
23 views

Combining several rasters before r.surf.contour?

I have been trying to generate an elevation model from contour lines using first v.to.rast.attr and then r.surf.contour. Generally, it works pretty well, execpt for one issue. My data contains a lot ...
1
vote
1answer
32 views

How do I remove TIR bands from current stacked ASTER

How do I remove TIR from already stacked ASTR that has VIS and SWIR bands. I want to do it in ENVI 5.0. Is there a workaround to do this ? The bands I stacked has VIS, SWIR, and TIR.
2
votes
2answers
139 views

Digital Number (DN) on satellite imagery? [closed]

How would I know if any of the satellite imagery (Landsat, ASTER, Quickbird and so on) have DN or Digital Numbers such as integer or uninteger on its pixel. I download from the USGS EarthExplorer and ...
2
votes
1answer
34 views

Postgis Raster merge geometry

I have a raster table and a geometry table in postgis. My goal is to create a single raster merging elements from both:- WITH geom_raster AS ( SELECT wkb_geometry, ST_AsRaster(wkb_geometry, ...
2
votes
0answers
48 views

How to create cost surface for least cost water transport analysis?

I am working on a project to derive least cost pathways between sites by dug out canoe travel. Has anyone worked on a similar project or found a function like the Tobler hiking function that can be ...
2
votes
0answers
33 views

Does converting polygon to raster generate more accurate results from the Zonal Statistics in Arcgis 10.2

I have heard the following for Arcgis 9.1 and wonder whether it is still an issue in Arcgis 10.2. If so, should I convert the polygon into raster before dissolve or convert the dissolved polygon ...
1
vote
0answers
24 views

Fill holes with an area bigger of a specific value in a raster coverage

I want to fill some areas of a raster coverage with a value of my choice. Those areas now contain NODATA values. So, they look like holes in my coverage. I know I could use r.clump function of GRASS, ...
1
vote
0answers
21 views

ArcGIS 9.2 - Problem importing raster into geodatabase

When I try to import a raster (jpg or tiff) into a file geodatabase using ArcCatalog, MS Picture Manager opens and tries (unsuccessfully) to open RasterConversion.py located in my ArcGIS program files ...
1
vote
1answer
44 views

Make a Ground Mask raster with the Greater Than tool (DEMs are generated from LiDAR)

I'm trying to see if I can replicate the Esri solar suitability site example from this article. I fail on the creation of the binary ground raster. I have made a Bare Earth raster from LiDAR ground ...
-1
votes
1answer
52 views

Raster Calculator Workaround in Arcpy for Suitabiliy Analysis

This is my first attempt at a complex stand alone python code. I am self teaching the arcpy module, well at least attempting to. I am having a great deal of difficulty getting my site suitability ...
0
votes
1answer
22 views

Importing a Geotiff into WhiteBox

I am looking for an opensource solution to create a seamless air photo mosaic. I came across WhiteBox from the University of Guelph which seems like it might do the trick, but it does not support ...
1
vote
0answers
31 views

Analyse effect of groups on raster maps

I work with a mechanistic model that uses climate data to simulate some specific output for different time steps and spatial locations. Now I want to investigate the effect of different climate data ...
0
votes
1answer
41 views

Raster To Ascii cmd-line tool

Where can I find a tool like ArcGis: Raster_to_ASCII Provided that the tool MUST be accessible through command line interface.
4
votes
1answer
79 views

How to automatically check for lidar flight line overlaps?

I have a series of lidar-based raster products created via FUSION. Since I am working with low density lidar data, many of the raster images show significant striping where lidar returns overlap on ...
1
vote
1answer
46 views

How to remove thin lines and small points from qgis raster

I want to digitize the roads of a raster map to vector format using QGIS and GDAL preferably. By using the Raster Calculator I have been able to extract the roads and contour-lines from the raster to ...
0
votes
1answer
43 views

How can I create an animation with raster data in qgis?

I have 4 raster images showing different coniditions of air flow distribution at different times. I'd like to create an animation to show the change from image 1 to image 4. How can I do this? I tried ...
1
vote
1answer
35 views

Exporting .tif from referenced mosaic dataset does not use functions in raster dataset

Very frustrating little issue in ArcGIS 10.1 -- I have a referenced mosaic dataset of terrain data that has a series of functions inserted (slope and several iterations of a statistics function to ...
0
votes
0answers
26 views

Calculating raster values from center to edges to represent normal distribution

Edit for simplification/clarification: What I want to do is take a raster and calculate cell values from center to edges such that the center has an arbitrarily determined high value which decreases ...
1
vote
1answer
87 views

Geodjango read raster files

I am developing a web app in geodjango (django) framework but I need to import raster files. Is it possible a geodjango app read raster files from a directory? Thanks
3
votes
3answers
59 views

QGIS Mosaicing with null values in images

I have a set of landuse landcover data which needs to be mosaiced. Whenever i try using QGIS Raster>miscellenous>merge tool. giving no datavalue as '0', it returns either (A) ' Traceback (most ...
0
votes
1answer
29 views

How do you set sea level elevation to white in terrain analysis?

I have ASTER files I am working with to create a shaded relief background for some other vector shapefiles. In experimenting with different color-elevation options, I am unable to have the Terrain ...
0
votes
1answer
59 views

Weighted Overlay with “nodata” cells

I´m currently conducting a suitability analysis with the weighted overlay function. One relevant criteria is the proximity to highways. If the wind turbine is located up to 300 m away from the ...
1
vote
1answer
37 views

Show raster data in WEB

I have downloaded Landsat8 image and use matlab to processing temperature and vegetation. Then I insert data into PostGIS. I used QGIS to display the results but i want show in web. How to display the ...
0
votes
0answers
39 views

Error: .asc is not a supported raster data source

I am new using QGIS and struggling with this error "...... .asc is not a supported raster data source" when trying to add a ."asc" file as a raster. I downloaded the files from ...
0
votes
1answer
54 views

Is there any method to choose the value of each pixel according to land cover

I have 2 images; one is land cover image (imgA) and monthly mean temperature image (imgB). I'd like to choose value of each pixel from imgB corresponding to imgA. WhaT I expected is each pixel of ...
1
vote
1answer
80 views

extract shapefile attributes from raster colors

I have two layers: a shapefile with states and counties (shp) a raster file (with colors and some text and borders, but not a perfect map) (tiff) I want to use the colors in the raster file to ...
1
vote
1answer
76 views

ArcGIS model builder: How to reclassify 16,000+ rasters and do weighted sums on these rasters per year?

I've been trying to build a model in model builder (ArcGIS 10.1) which can do the following task: I have a folder full of ca. 16,000 raster files (.asc) representing mean temperatures for each day ...
1
vote
0answers
63 views

Problem with polygon overlay in raster stats using gdal

I am using the raster_stats module in python to calculate the mean carbon value for different sets of polygons. Here is the code that I am using: africa_sat = ...
0
votes
2answers
78 views

Reading a raster map cells values in C#?

Suppose I have a raster map file (TIFF, TGA, JNG... etc) loaded with geo-info manifested by the cells values. I need to read the values of the raster map cells "programatically" in a C# program. P.S: ...
3
votes
1answer
72 views

How can I save and re-apply symbology properties for a classified raster in ArcMap 10.2?

I have a classified raster which has the desired symbology configured in ArcMap, and I want to apply this symbology to other similar rasters. So I use the Save option on the Symbology tab, intending ...
1
vote
0answers
57 views

How to create a circle vector layer with 12 sectors with Python and to save average value of underlying raster in each sector?

Hi I am writing a code with Python 2.7 using Arcpy 10.1 and I guess I am doing stuck with a silly problem that lies under my eyes. I have created a grid of points (with "Create fishnet" function) over ...
1
vote
1answer
41 views

Eliminate 0 Values From Raster

Arcgis 10.2 I currently have a raster file that I want to turn into a set of polygons. This will help me to create specific buffers around certain points. The extent of my values are 0, and 1. When I ...
2
votes
0answers
42 views

Comparing/Correlating NDVI Rasters with other index Raster

So, I've created two rasters. One for NDVI and one for another index for surface water from the same orthorectified World-View 2 image. I can visually see how the indexes are inversely proportional. ...
0
votes
2answers
239 views

using Python to calculate NDVI, output as a Geotiff

I need a script that can calculate NDVI from two separate input Geotiff files, then output the results as a Geotiff. I wrote following script, most of which is borrowed from various on-line sources ...