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

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29 views

How to export vector file in GrassGIS to QGIS

I am using GrassGIS to analyze watershed. I created a stream vector extracted from raster elevation data, how to extract the stream vector file so I can open it using QGIS?
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1answer
378 views

How to store Large Raster Images of Equipotential Surface Generation Using Monte Carlo Simulation?

I have a large (1GB+) raster that I am using as the base for the generation of an equipotential surface. This is to assess the accuracy of DEMs derived from another source. In situ observation is ...
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1answer
33 views

32-bit Map tiles for use with leaflet

I've got a lot of single-band Geotiff files with the GDT_Float32 format and I need to present these over the web, hopefully using a webmap leaflet/mapbox/googlemaps widget where clients can hover over ...
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1answer
272 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 ...
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1answer
339 views

How to use GDAL to burn a selected value from one raster into another?

I think this should be a relatively simple process, but I'm not quite sure how to approach it. I have a shapefile containing 1000's of polygons. I also have 19 rasters. All of the polygons fall ...
2
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0answers
28 views

How to get 4 values for different Indexes and names of rasters for set of points? [closed]

I am trying to get 4 values for different Indexes and names of rasters for set of points, but get problem with defining function def extractIndex(raster, pathName). #List of Folders 4 Folders ...
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0answers
28 views

Why ArcGIS crashes when I load raster file created in R? (HFA format)

I was processing my raster operation in R, as I think it's easier then in ArcGIS: - read shp + raster1 - crop them - classify raster1 by location - create classified raster2 - export the ...
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1answer
28 views

Problem with algebra formulas for work with gdal_calc.py

I'm trying to update some values of a raster based on another raster. 1st raster (A): landuse data (values from 10 to 240) 2nd raster (B): mask data (only nodata values and a given value, for ...
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2answers
1k views

Changing color of raster images based on their data values - gdal

Let's say I have 1 band raster images with Gray Color Interpretation and I want to change their color based on their data values. Data values -1, will be Blue, -0.5 will be Light Blue, 0 will be ...
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0answers
29 views

Create a grid over shapefile then save each section into GeoTIFF

I have a massive shapefile with 200,000+ building polygons. I've loaded these up in ArcGIS. I need to convert this into a usable raster (GeoTIFF) that can then be tiled using MapTiler. My current ...
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1answer
20 views

How to I change the extents of a Euclidian Distance Raster?

I am calculating the Euclidean distance of a set of points. The output raster truncates the resulting raster image to the farthest north, south, east, and west point. I need the distances to extend ...
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2answers
240 views

Is there anywhere that I can obtain global UV data in either raster or vector format?

I'm looking for some UV data (currently with no spatial or temporal resolutions in mind, but ideally split into UV-A and UV-B) for the whole earth. Can anyone recommend a source for data like this or ...
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1answer
40 views

Reclassifying raster analysis (like the one in ArcGIS Spatial Analyst) in QGIS [duplicate]

I am trying to reclassify raster (DEM) in QGIS. I know how it is done in ArcGIS (Spatial Analyst, reclassify option), but I would like to know how it is done in QGIS?. The point of my exercise is to ...
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2answers
150 views

QGIS 2.10, csv points to vector grid

I have a series of point data from a .csv file that I would like to display as a heatmap raster, the .csv data have various attributes with them and I would like to adjust the color ramp based on ...
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2answers
308 views

Remove sections, defined by a line or polygon, from a raster in QGIS

(QGIS 2.6.0 on Windows.) I have created a raster layer of heights using the TIN interpolate function. I also have another raster layer with more accurate information on the height of particular areas ...
11
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2answers
4k views

Aggregating points to grid using R

I have a question with regard to spatial aggregation in R. What I am trying to do is aggregate a point dataset to a grid. I am unsure however how to do this as I have little experience with this sort ...
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1answer
108 views

TIMESAT input image requirement?

I tried to work on TIMESAT but always facing a problem. Here is the method I have used. Seems correct, but I get a warning at the end. I have created a NDVI file from ENVI 4.8 >> Transform >> NDVI ...
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0answers
21 views

Problems to export raster files in R software

I'm working with R software with raster and netcdf4 packages adn netcdf files to get information from SST. I got the information and now I'd like to convert in ascii or geotiff files to work in ArcMap ...
2
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1answer
194 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 ...
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1answer
82 views

Writing result of PyQGIS to shapefile

I try to perform some zonal statistics on a shape- and rasterfile and write the output to a completely new shapefile! import sys # where is the module ...
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0answers
24 views

Polygon to Raster: Cells with multiple values

I'm trying to use R to rasterize a number of shapefiles and I'm having trouble dealing with cells on the edge of shapes, in other words the if a cell is partially covered by an NA value and partially ...
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0answers
88 views

Error when I try to convert Corine Land Cover 2000 tiff to shapefile in QGIS 2.10.1 or clip CLC2000 by a polygon

I want to clip Corine Land Cover 2000 tiff by a polygon or to convert it to shapefile in QGIS 2.10.1. So far I have tried the following always getting an error message that 'ascii' codec can't encode ...
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0answers
22 views

Calculating the distance between points and parts of a underlying raster set

I need your help with a calculation of the distance between points (cities in this case) and forest (raster data). Is there a possibility to collate to every city the distance to the nearest forest ...
2
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1answer
13 views

Quartiles from Raster Layer band

I'm building a plugin from QGIS, and I need to extract the values from the quartiles from a band in a raster layer. Does anyone knows how it is done?
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1answer
24 views

Extract elevation values from WMS DEM to points

I have a points feature class that I am trying to get elevation values for the state of texas. ArcGIS Online conveniently has a DEM for the entire state as a WMS. I am wondering if there is a way to ...
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0answers
19 views

Read GeoTiff from memory in GDAL

Is it possible with the GDAL library to read an image (e.g. GeoTiff) from a memory stream, like stdin instead of a defined location on the local disk? It would be useful to read data in streaming ...
2
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1answer
48 views

Why do “stripes” appear on raster?

I am reprojecting a SRTM 3 arc-second raster file from WGS84 geographic coordinate system, to projected coordinate system which is using Azimuthal Equidistant projection: gdalwarp -s_srs EPSG:4326 ...
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1answer
37 views

csv points into raster using R

I have got the forest cover data of a region in africa (raster layer) and some data collected inside this region by a survey (.csv). In the .csv file I have got x,y coordinates and 3 other columns ...
3
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1answer
72 views

Export raster layer in python to specific folder

I am trying to export existing raster layers as tif files. I just want to avoid saving each raster manually. this is the code I am trying to use, but it doesn't seem to work: from PyQt4.QtCore import ...
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1answer
21 views

How can i project a coordinate system for many rasters all at once? [duplicate]

help many rasters i have and should be projected in UTM coordinate system. what should i do?
2
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1answer
617 views

Create a subset of a dataset with a specific grid size in ArcGIS using Data Management Tool

I am wondering how you can create a subset of a dataset that is a specific grid size (in pixels) using the Clip tool within the Data Management Tool box for raster data. I was trying to find a hint ...
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0answers
21 views

Percent overlaying [duplicate]

I have a raster dataset of points and a polygon features. The two are over the same area and I am trying to find the percent of the raster that overlaps the polygon features. I have tried clip, ...
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0answers
13 views

Use SVM to make prediction based on two Raster input in R

Right Now I have two raster images, one is elevation another one is slope. And I already generate a SVM model in R. Right now I want to use this SVM model to make a classification prediction using the ...
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5answers
7k views

How to convert LAS to GRID/Raster for ArcGIS input?

I was wondering if there is an option to convert LAS (LIDAR data) to raster or GRID format that ArcGIS could read it.
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1answer
38 views

Intersection of a raster and polygon in ArcGIS 10.3

I have two data sets one raster and one polygon. I am interested to see learning the area where the two overlap. I was thinking that I could use the intersect function, but since one of the layers are ...
3
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0answers
53 views

GDAL_merge - Stacking Files - Nodata Value wrong

I masked a large raster stack by separating the stack in 18 chunks, masking each and writing each chunk to a file (due to memory problems). Then, I use gdal_merge to stack the 18 GTiff files. All ...
3
votes
1answer
41 views

unexpected output from raster calculator function

Working in ArcMap, I am trying to convert the logit values in raster into their actual probabilities (logistic regression,) using the following function: 1/(1+Exp(-"sn_topo_poly_log")) Ive used this ...
0
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1answer
811 views

Raster and vector layer in the same CRS don't match

While adding multiple raster and vector layers (and setting them all in CRS WGS84) in QGIS 2.2, they don't seem to overlap. Interestingly enough, only raster files overlap between each other, the same ...
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1answer
55 views

Remove/subset raster bands in Python GDAL

I'm trying to remove bands from a raster I have. Basically I just want the first band as a new GeoTIFF file. Here is my code so far: #!/usr/local/bin/python from osgeo import gdal # Load my GeoTIFF ...
4
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0answers
44 views

How to get NIR values into a LAS file then a CSV?

We are trying to deliver a LAS file with NIR values added for each point. The NIR comes from a raster captured at the same moment as the LiDAR, and is stored as an 8bit number along with RGB in 8bit. ...
5
votes
2answers
286 views

filling up a depression to create new surface

A collegue here has a problem I cannot help with. She has the surface (as raster) of a landslide release area (from AFTER the slide) and wants to calculate the calculate the theoretical/approximate ...
2
votes
1answer
33 views

Raster rotation on QGIS

How can I rotate a raster layer (global land-mass) to make the 180 deg longitude the center of the map (using QGIS)? 'rotate' function in R is simple but not accurate. Raster has 'longlat' projection ...
2
votes
4answers
326 views

How do I eliminate the black border on a georeferenced map layer?

I have geo-referenced several scanned maps. Theses are placed side by side on separate layers in QGIS. They overlay other older maps of the same areas. Georeferencing caused the maps to have black ...
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0answers
18 views

problem with raster calculator syntax [closed]

I am trying to build a raster representing the output from a logistic regression model. i keep getting syntax errors. heres the script: -2.41-(15.97 * "Topographic_Predictors\wadem10m_annsolrad") - ...
2
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1answer
301 views

Georeference multiple raster layers of same area at once or identically

I have many raster layers that I need to georeference to my existing vector layers. Data types vary between 8 bit unsigned, 32 bit float, and bit 64 float. All have the exact same extent, cell size, ...
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1answer
41 views

QGIS Script Editor to get operations between raster and float number

I am looking for developing python codes mainly for working with raster data, in particular satellite imagery from Landsat. I need to write a script (into the QGIS Script Editor) to make operations ...
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1answer
52 views

Resampling a raster file with GDAL C#

Is it possible to resample the raster by using GDAL C# binaries, in a way that every other cell in a row and column is removed? Basically a replication of this GDAL command: gdal_translate -outsize ...
4
votes
1answer
505 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 ...
0
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1answer
50 views

Which format is more convenient to publish in Erdas Apollo?

I am from Bolivia and I need to publish some Satellite images in Erdas Apollo. My question is Which format is more convenient for publish in this software?, because I have Landsat5 TM images in TIFF ...
2
votes
0answers
37 views

QGIS raster style rendering incorrectly/unexpectedly

I have a raster of flow accumulation. To style it, when I set manual values for raster breaks in qgis 2.14 it isn't rendering all values below the value I set in the same colour. My understanding is ...