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

learn more… | top users | synonyms

2
votes
2answers
49 views

Clip raster with shapefile and set a value outside the mask

I want to clip a raster using a shape file with the command: gdalwarp -cutline INPUT.shp INPUT.tif OUTPUT.tif from this answer. However I want to set the pixels outside the mask to a particular ...
2
votes
1answer
39 views

Clipping a Raster

I'm facing a strange problem. I created a mosaic of two landsat scenes which contains values from ~ -5 to ~11 (Biomass estimation). As my study area is much smaller then the mosaiced Landsat8 scenes, ...
2
votes
1answer
198 views

3d arcgis raster .tiff image to CFD software

I am trying to export 3d raster image prepared in ArcGIS to cfd package such as Fluent. I was wondering if anyone has experience to convert raster image to autocad 3d format, stl, vrml or any other ...
-3
votes
0answers
15 views

Research project on “carpooling recommendations” [on hold]

I am working on a research project on "carpooling recommendations". I want to simulate an environment where taxicabs with attributes (ID, current location of taxi ,number of passengers in taxi) will ...
0
votes
0answers
10 views

How to use gdal_calc.py for multi-band images?

My problem is that I have multi-band images (8 bands) in GEOTIFF format and I tried to use gdal_calc.py to calculate a conditional expression between those bands. However, I could not make it because ...
-3
votes
0answers
26 views

4 sequential Landsat image cant be merged into one single file, in QGIS. how to solve this issue?

i am trying to create land-use, land cover classification by QGIS. i have Landsat images downloaded from earth explorer. these are *.tiff files. but my region is not covered by single pic. thats why, ...
1
vote
0answers
17 views

Can I use georeferenced jpeg raster as map layer in GeoJSON.io?

Can I use georeferenced .jpeg raster as map layer in GeoJSON.io? I thought that I could, but it doesn't work. I converted .tif raster visualization of LiDAR data to georeferenced jpeg. After this, I ...
0
votes
2answers
23 views

How to efficiently extract time series from a very large multi-band GeoTiff in R?

First some context: I want to run a time-series analysis function that is only available in R for a continental sized multi-band time-series raster, which is stored in disk in GeoTiff format, that was ...
0
votes
3answers
42 views

Create continuous raster from point values in 10.1?

I have a point dataset of nearly 400 points containing percentage values of cost total for the site the point is representing Is there a way to create a smooth continuous raster surface across the ...
0
votes
1answer
61 views

Drawing concentric circles that correspond to free space loss formula?

I want to be able to draw a circle with 50km radius and then fill the circle with values corresponding to the free space loss formula below: FSPL(db)=20 log10(d)+20log10(f)+32.44 for example: a ...
1
vote
0answers
121 views

Error to add store through cURL REST API too geoserver

I have problem with adding raster layer to geoserver automatically. I need, that geoserver add layer without person job, only script action and i saw that it may be done with cURL REST API but, i can'...
0
votes
0answers
4 views

Raster cleanup eraser fail in ArcGIS for Desktop?

I am running ArcGIS 10.3 ArcScan and trying to clean up a raster prior to vectorisation. The raster was a three band raster converted to greyscale using the 'Greyscale function', classified into 2 ...
2
votes
2answers
51 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 ...
0
votes
1answer
22 views

In R's raster::terrain function, which way is north?

The terrain function in R's raster package calculates slope and aspect from an elevation raster: see http://www.inside-r.org/packages/cran/raster/docs/terrain. With the unit="degrees" option, the ...
1
vote
1answer
285 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
2answers
21 views

ArcGIS Online - Need to upload lots of raster files/georeferenced maps. How?

The end goal is to build a web application where people can explore the historical maps I've georeferenced - among other things. ArcGIS online is the ideal venue for everything else I want, but for ...
0
votes
0answers
23 views

Calculate exact percentile for each rastercell and create new raster with percentile values [on hold]

I need to calculate the exact percentile value of each raster cell in a raster layer, in order to create a new raster layer with this exact (decimal) percentiles. (In excel this function would be "...
0
votes
1answer
293 views

What exact format do I need to have for the inputs to make Path Distance work?

I am trying to run the Path Distance tool in ArcGis 10.1. Ideally I would like to utilize Tobler's hiking formula anisotropic approach to slope and a land cover cost surface to calculate the least ...
0
votes
0answers
9 views

Raster to CSV with x y cell center coordinates, the original raster cell value, and values from another raster avoiding shapefile

I am looking for FOSS (maybe GDAL/OGR) solutions to a problem. I need to go from raster (200 million records) to CSV. It is easy enough to do via point but the point file breaks the allowable 2GB “...
0
votes
0answers
11 views

Single value of raster displays as transparent?

I have a GeoTiff raster that I'm trying to style, but a single value (1 of 8) refuses to take on any color. It always displays as transparent. Any idea of why this is / how to resolve it? Working in ...
5
votes
4answers
108 views

How to efficiently access files with GDAL from an S3 bucket using VSIS3?

So, GDAL has recently added a new feature that allows random reading of S3 bucket files. I am looking to crop GDAL images from multiple tiles of an image without having to download the whole file. I'...
0
votes
1answer
85 views

Cannot find information about my.table table in raster_columns [on hold]

I am running PostgreSQL 9.4 and PostGIS 2.1 and have loaded a small piece USGS SRTM data for North America successfully into my database. I am attempting to export a small piece of of the rasters I ...
2
votes
1answer
65 views

How to create azimuth raster layer by pyqgis?

I want to create an azimuth raster layer base of single point shapefile, for this I write below code that create a memory point layer that each point in memory layer is center of each pixel and have a ...
0
votes
2answers
650 views

problem to open a netCDF and create a raster file

I want to open a netCDF file and create a raster with ArcMap 10.2. The file contains the mean monthly temperature for Switzerland. I found it in meteoswiss web site. I tried to open it with the ...
0
votes
1answer
81 views

Extracting Data from Raster based on Aspect Raster file

I have 2 rasters, ones shows aspect and another shows date of snow thaw. I want to extract the date of snow melt based on values from the aspect raster. For example I want all the snow thaw dates from ...
2
votes
1answer
960 views

How to fill holes/missing values in XYZ data / a DEM with QGIS?

I have equidistant XYZ point (text) data that I used to create a point grid. However, it's not perfect - there are some holes. I then created a DSM raster from it, which obviously has the holes too. ...
1
vote
1answer
26 views

How to resize a raster SUMMING the values of pixels in QGIS?

I would like to be able to resize a raster such that the values of the resized pixels are based on the SUMS of the original raster pixels, rather than the averages. The output should be generated thus:...
2
votes
2answers
212 views

Suitable Raster processing methods to extract field boundaries from images

I'm trying to extract field boundaries and features from a lot of aerial images of agricultural land - and avoid digitizing these features manually. I've managed to get a crude raster file of the ...
0
votes
0answers
14 views

dismo::randomPoints generating fewer points than requested in R

I'm using the randomPoints function in the dismo package to generate sets of point locations within two polygons. I've converted the polygons to rasters, where the cells within the polygon = 1, and ...
0
votes
1answer
28 views

Self-hosted web app to view raster & vector layers and annotate

I'm trying to find a self-hosted web app that allows you to view a number of raster and vector layers on a draggable web map, and then to 'annotate' the map by adding points to the map with associated ...
0
votes
0answers
13 views

Rescale raster files in QGIS

I want to construct a surface of predictions in QGIS, using several probabilities I otained previously in R, by constructing GLMM. But I rescaled my variables before constructing GLMM, so I also need ...
1
vote
1answer
304 views

Calculate tree cover over certain area from raster data

Last year Hansen et al. published Global Forest Change map as set of raster data available in TIFF format. Basically those are 30-meters resolution satellite images with pixel values ranging from 0 (...
1
vote
2answers
1k views

GDAL/proj4 equirectangular projection coordinate system units assumed by OGRSpatialReference and GDALDataset::GetGeoTransform()?

How do I configure my OGRSpatialReference object to specify an equirectangular projection system http://en.wikipedia.org/wiki/Equirectangular_projection where the affine geo-transform matrix (provided ...
0
votes
1answer
219 views

How to get projection data (.prj) of raster image using GDAL/OGR?

I start with a boundary shape-file (think U.S. states) in lat/long that I convert to some projection, and then rasterize the result as a .tif. What I need now are the raster coordinates of the ...
2
votes
1answer
38 views

Recording height profile from raster along a polyline shapefile?

I'm looking for the easiest way to record a series of raster values along a 400 meter transect in ArcGIS 10.3.1. I'm working with a LiDAR canopy height model with 3mx3m cells where each cell ...
0
votes
0answers
21 views

Land cover generation

I am working on a river watershed on QGIS and I need a land cover map. I have a good raster of land use data with 15 m resolution for year 2015, but it covers around the 90 % of the basin. I have ...
13
votes
4answers
4k views

Calculating elevation profile along line from a DEM?

Given a DEM (Digital Elevation Model) and a line (x1,y1) --> (x2,y2) (paired coordinates (x,y)), how can one calculate the elevation profile or cross-section projected on that line? I am looking for ...
0
votes
0answers
27 views

Looping extract by mask from raster list using ArcPy gives ERROR 99999? [closed]

I am getting an error when I try to iterate raster files through the extract by mask tool. I am running ArcMap 10.2.2 and the Arcpy script I am try to use follows: # Import arcpy module import arcpy ...
1
vote
2answers
197 views

add multiple rasters, each located a branch too deep in separate folders - ArcGIS

I have a year of daily raster datasets (365) that I would like to use the Cell Statistics tool on; however, each raster is located in a separate folder so I cannot add all of them at once. ie: -...
1
vote
2answers
226 views

Creating a raster file from a shapefile using GeoTools with different colours for different features

The shapefiles that I am processing display information on an operation of a piece of equipment over an area, where the information is stored in steps as polygon features with various attributes and ...
0
votes
1answer
1k views

Arcpy Subtracting rasters error - TypeError: 'unicode' object is not callable

I have a script which subtracts 2 versions of the same raster from each other (one newer than the other) and then extracts the additions & deletions that have happened. I created a simple test ...
9
votes
2answers
1k views

GeoTIFFs made in GDAL don't have min/max range when loaded in Arc/QGIS

I'm creating some floating point rasters in GDAL with the GeoTIFF driver. When I load the resulting images into QGIS or Arc the default symbology puts the min at -3.40282e38 and max to 3.40282e38, so ...
0
votes
2answers
377 views

Extracting multiple values of raster to polygons using ArcGIS for Desktop?

I was hoping I could get some help on how to extract information from a land use raster using polygons. I have a layer with 157 polygons and a land use raster with multiple land use categories for the ...
0
votes
1answer
10 views

r.statistics throws invalid reclass rule error despite assigning null to unique value

Trying to run r.statistics on two raster layers, one a layer of distinct zones produced via r.clump (stands) and one a layer of all ones (ones). The areas outside of the immediate region of interest ...
0
votes
2answers
18 views

Problem with r.grow.distance on GRASS

I would like to use r.grow.distance on a raster map. I rasterised a shapefile (about 50 cities in a region) and we can see them on the raster map. Yet, when I launch r.grow.distance, I have a ...
1
vote
1answer
483 views

Convert Raster to Numpy Array with only Arcpy and Numpy

All the articles I'm finding including GDAL or PIL(?) which I cannot use. So I am trying to convert a raster I have to a Numpy Array with Arcpy and Numpy and then calculate some statistics on it but ...
1
vote
1answer
30 views

Applying symbology to raster layer in ArcPy without using symbology layer (layer file)?

I have a raster layer with 3 unique values (1,2,3) and I want to apply a unique color to each using RGB values or hex codes, without the use of a symbology layer (layer file). Is it possible to ...
1
vote
2answers
111 views

Get Raster Centroid using Arcpy

Purpose:To take an input raster image and clip its shape to a parcel block. In later stages this model will be applied to a loop. Logic: The Model receives an input raster image and calculates a ...
0
votes
1answer
14 views

Extract lat long point values from EASE2 without reprojection

I have the following file: EASE2 and want to extract the values for this geographic location (148.1, -35.6) #lon lat. How can I do this without the need for reprojecting the ease grid file into ...
2
votes
3answers
3k views

Coordinates of raster image from .TAB file

I have got a raster image (tif) from a mapping site and an associated .TAB file. I am trying to correctly map it into CAD/3d model - which I know is set up to the correct coordinates. The .TAB file ...