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

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How to store large time series of raster images

I've got a large time-series of rasters, derived from satellite images. Each raster is about 2000 x 2000 pixels, and I've got about 10,000 individual images. I'm trying to work out what the best way ...
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25 views

DEM from Google Earth, Natural neighbour fails

Does anybody know, why using the tool Natural neighbour fails, when trying to get raster from shape? I followed the instructions here: https://www.youtube.com/watch?v=bLbY3iMBW-A, but all I get are ...
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Merge village level shapefiles by sub_district_ID to get a new shapefile using R

I am new to using R for manipulating shapefiles and need help with merging the areas inside the shapefile to a superset based on the sub_district_IDs and get a new shapefile.
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How to build a raster (population density) dependend diagram in QGIS?

I'm using QGIS and trying to solve the following problem. I got 2 layers: 1. population density raster 2. point layer with the information about number of people could be hosted/served etc in this ...
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34 views

Average raster to single value in ArcMap

I need to shift a raster a small bit. I got the distance and the direction using the path distance and cost path tools. I walked into two problems. I have a raster with distance values. I want to ...
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32 views

Bands Names QGIS when merging rasters

I have downloaded landsat satellite data, then I merged the 4 bands I am interested in into one file (raster-merge). The problem is that I merged bands 2,3,4 and 8, and in the merged file the bands ...
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8 views

Rasterize all layer attributes with gdal.RasterizeLayer

I want to rasterize a layer and to have a 2 bands raster in output where the first band is the first feature of the layer and the second one represent the second feature. I tried that but i have an ...
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25 views

Reprojecting multiple rasters in ArcGIS Desktop?

I have classified layers of Landsat 5 and 7 of several years in Geographic coordinate system WGS84. To reproject this to UTM, is there a simpler way than using Project Raster tool in ArcToolbox?
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29 views

How do you convert a raster of digital values of ndvi to an index of NDVI?

I have a raster of the Mean May Normalized Difference Vegetation Index (NDVI) that is a composited measure of VGT daily images, acquired between 2000 and 2009 in May, using the Mean Compositing ...
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41 views

Correctly querying a raster mask only

I have a rasterA (whole Scandinavia, with values from 0-255) and a rasterB (in blue, a small part of south of Norway, entirely inside rasterA). I want to query the pixels of rasterA which are inside ...
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clipped raster but attribute table not updated?

I have a nightlights raster file of India, and I clipped it using the block shapefile for India. After the clipping, the clipped raster files have the attribute of the original raster file. I want the ...
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44 views

How to make mosaic automatically from quadrocopter photos?

I have many aerial photos (not georeferenced) from a quadrocopter and I want to make a mosaic from them, but it takes so much time. Could you help me with this problem or give me advice on programs ...
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24 views

How do I make a grid around all my points, and then convert it to a polygon [duplicate]

I want to make a grid around all my points, convert to a polygon and use this to clip the extent of my data. I am using Arc 10.2. How do I make a grid and then convert it to a polygon? Or is there a ...
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29 views

Interative raster with PostGIS

I'm searching some solution to show raster layers from PostGIS on a Web Page. I need a solution to build a interactive map showing the values of my raster data when the user to click on pixel of the ...
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25 views

R - `rasterize` of polygon fails to properly take account of internal hole

I'm trying to use R to mask out a DEM raster using a polygon (loaded from a GML shape file) using the following code, where dem_modern is the raster and modern_land_shape is the vector polygon : # ...
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11 views

Alignment in ST_Intersection with PostGIS raster

Trying to intersect two rasters, but they don't have the same scale. I have to do everything in one query. The query below gets the following error: The two rasters provided do not have the same ...
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24 views

How can I use ST_Intersection with two rasters?

I need to query all values in raster A which intersect with raster B. Found this, but it's not accurate, and I'm getting ERROR: column reference "rast" is ambiguous. WITH first AS ( SELECT id, (...
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64 views

R-Studio0.99, How to compute correlation between two rasters and serial correlation

I am using R.Studio0.99 version installed on my HP Laptop 4th generation (8GB RAM) windows 8 operating system and I know how to use R studio and some of the library to incorporate spatial data (raster,...
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44 views

Counting number of raster groups within buffer layer?

I am trying to count the number of times each category of a raster layer appears in a buffer square. I have attached a picture to help explain. In the picture example I would want the 'red group' to ...
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11 views

Raster Layer doesn't display, TileMill

I'm attempting to add a raster layer to TileMill, but for some reason the raster doesn't seem to be reading in correctly. I used gdalwarp to reproject the raster file to EPSG:3857 and then import it, ...
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raster::intersect not producing expected results

I am having trouble with R's raster::intersect method. I give intersect a SpatialPolygonsDataFrame and SpatialPoints as documented in the raster reference manual (p. 111). The result acts like it ...
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58 views

Extraction of raster with shapefile python

I have a raster tiff file containing vegetation index & also a shapefile of fields. I want to extract the field wise values from that raster file using GDAL. How can I do this? I can read the ...
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13 views

Single channel Change Detection

I want to write script for Google Earth Engine, which will create bitwise mask of changes. Earlier I made through ScanEx Image Processor and this function is called "Single channel change detection". ...
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22 views

Unsupported Source

If I try to save a raster files from a WMS once saved tells me that the source is not supported, "Data Source not supported: /Users/beatriceluise/Desktop/wms/Senza titolo.tif is a raster data source ...
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34 views

Spatial correlograms for binary raster?

I have binary raster data (deforestation hotspot or not) that I would like to plot spatial correlograms for in R, to look at spatial autocorrelation over different spatial lags. I came across this ...
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50 views

Vector tiles to MBTiles

I need some clarification regarding MBTiles. I am generating MBTiles in 2 different ways: Using TileMill Using Mapbox tm2 to MBTile using TileCloud In TileMill, does the exported MBTile contain ...
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Overlaying data from a raster generated using Interpolation tool with Shapefile or a raster

For my project, I intend to identify if parameter A has been exceeded in forests. I have a shapefile for forests and converted that to a raster (if needed). I have point data for Parameter. I used the ...
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1answer
48 views

Getting long-lat coordinates from NARR LCC-gridded data using raster and rgdal in r

I am studying migration ecology of sea ducks on the Atlantic coast of North America. In my analysis, I require substantial environmental data over a large geographic range for the past 15 years and ...
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41 views

PostGIS raster to UTFGrid

I am trying to create a UTFgrid JSON with a Raster in PostGIS. The goal is to provide weather data for web maps. I found some libraries: https://github.com/Ecotrust/create-utfgrids https://github....
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34 views

Per-pixel Descriptive Statistics through multiple Raster layers

I'm looking for computing different descriptive statistics through a set of raster layers. I need to make it with a python script capable of running into a standalone tool within the QGIS. To do so ...
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1answer
22 views

How to “clean up” undesired values in a slope raster

I have a reclassified slope raster with 3 values in band 1. My problem is that I want to polygonize this layer, but the surface is so irregular with a lot of plots in terraces and because of this it ...
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28 views

r.patch results in a blank map in GRASS

I have a collection of tiles downloaded from the EDINA Digimap service, in asc format. I imported these into GRASS using the r.in.gdal function, and they appear in the display screen as expected. I ...
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Error to obtain coordinate reference system argument from a raster image in R

I got an error when i wanted to obtain the CRS from stacklayer. I don´t know what could it be. I need some advice or help to obtain it. This is my code. #LOAD RASTER LIBRARY >library(rgdal) >...
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40 views

Rescale raster in R

What's the best way to rescale a raster with range 0, 200 to range -1 to 1 in R? I'm currently using gdal_translate, but this requires that I write out a new file with the updated range. If possible ...
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65 views

Problem aligning historic map of Poland [closed]

I have downloaded a historic map of Poland. I am having a problem aligning it to a modern map. I have tried various methods and coordinate system using over 50 points, but nothing works. It gets close,...
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34 views

Fill NoData raster cells with floating point value of closest cell

I am working in ArcMap 10.3.1 with Spatial Analyst tools. I have a raster with some large contiguous areas with NoData. I want to assign the floating point value of the closest cell to each NoData ...
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1answer
36 views

Extract rasterlayer from extent class

I used extract() function to get remote sensing image cell value.The same code to process tif file produce error message. Code as follows: r1 <- raster("2000_2605_1.1_km_monthly_NDVI.tif") ...
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73 views

Pixelated DSM using LAS Dataset to Raster?

I am using ArcGIS 10.2.2, and I am trying to create a DSM out of some LIDAR data. After checking the LAS Dataset properties, I see that I have an average point spacing of approx 0.3. I tried ...
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27 views

Converting raster data from netcdf to image

I'm rasterizing some wind data from oos.soest.hawaii.edu/erddap/griddap/NCEP_Global_Best to use as an overlay of a final image, but I'm having issues calculating the bounding box of the final image. ...
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32 views

Combining Data from raster and polygon

I am teaching myself GIS at the moment, and there are still some matters I haven't quite got the hang of. I'm using ArcGIS 10.1, and have three datasets: LAYER 1: A population dataset at a high ...
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1answer
55 views

Changing the origin of a raster?

I have a raster file that is projected not detailed enough. Every pixel in the raster should be replaced, just a bit. With ArcGIS I calculated the offset per pixel. I couldn't find a way to do this ...
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44 views

Calculating area of polygon within square mile in ArcGIS?

I would like to create a raster, where in every cell it returns the area of land in a polygon feature. So for example, every cell in the raster would give park land per square mile, or vacant land ...
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26 views

DEM to RGB-GeoTIFF (land-/waterarea colored separate)

I want to create a colored basemap out of a ETOPO dataset. Is there a way to color the land (masked by a landpolygon) and water area separate and combine them later. The result should be one GeoTIFF (...
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r.sim.water causes crash when run on GRASS 7

I'm trying to run r.sim.water on GRASS 7.0.3 (Windows), but the module crashes directly after starting, with no error message. I only get the message that python.exe doesn't work anymore and have to ...
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Reprojecting and Aggregating a 30m resolution raster to a 3 arcsec raster

I am a using a 30m x 30m resolution land use raster that is projected in NAD83 Québec Lambert but would like to convert it to make it compatible with a 3 arcsecond flow accumulation raster that is ...
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ArcGIS, Combine tool. Crashes once reaching 40% progress

I'm trying to combine 7 rasters containing soil related data. Rasters are 4.5G, give or take. All the rasters contain integer values. Once the combine tool reaches 40% progress, it stalls and arcmap ...
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35 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 ...
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Qgis: style a discrete raster

I have rasters with discrete values (Landuse categories, boolean values...). I would like to be able to style them in a discrete way: 0 -> Red 1 -> Blue 2 -> Green ... I wish something ...
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1answer
48 views

Failed DEM via Natural Neighbor in QGIS 2.14.2-Essen

Following the indications of Monde Geospatial (https://www.youtube.com/watch?v=bLbY3iMBW-A) I created a CSV file with the altitudinal data (Google Earth) for 2182 total points and imported it into ...
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55 views

smoothing raster layer stack using R

I'm trying to do smoothing for .tif stack layer of 331 bands. I used this code in R : setwd("D:\\") raster_dir <- "D:\\Modis VI quality\\" VI <- brick(paste(raster_dir,"...