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5.873 raster questions.

I'm trying to convert climate ASCII Data into a raster, but I always get a distorted raster. I'm using the ASCII to Raster Tool in ArcGIS. There are values like nlevels and ncircle in the header of ...

I'm using the rasterVIS package in R to create maps with levelplot, which works fine. But I cannot figure out how to add a spatial scale bar to the maps. Does anyone know?

I am trying to make a simple slope map from a DEM (tif). I already tried with the different slope-tools in QGIS (GDAL, SAGA, GRASS) and also the 3D Analyst in ArcMap. Boths bring the same result: a ...

I think this is a general enough question to apply to more than just gdal_calc, but perhaps not. When I run gdal_calc.py -A map.tif --outfile=deforestation_00-10.tif --NoDataValue=0 --calc="A >= ...

Im wondering if anyone has come across any data source that can be used to calculate the number of days where temperatures are greater than 0 degrees C, 10 C and 20 C at a global scale? I have a site ...

I need to show a raster layer in OpenLayers keeping its pixels as they are, i.e without iterpolating them when zooming in. I managed to do that with an ImageStatic source following this answer: https:...

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 ...

Using ArcMap, I am trying to classify/consolidate the symbology of these agriculture classes into 3 categories: Hay, Pasture/Grass, and Cropland. I also need to find the sum of acres of each of these ...

I'm using geoserver to stack several raster images that have different ELEVATION parameter (each ELEVATION "number" is a different layer so to speak). This raster images are 16-bit one channel ...

I am trying to classify a raster image with the Maximum Likelihood Classification tool. I understand from the ArcGIS Resource Center I need to input a signature file in the second field to tell the ...

I am new to python and QGIS (have some experience with arcpy). I am trying to multiply two .tif files together using gdal_calc.py but I can't get it to work. It just returns the error invalid syntax. ...

I'd like to know if there is a way to obtain statistical significance and p-value for correlation coefficients calculated for different raster in grass with the command r.covar All that I obtain is ...

When getting rasters to line up, should one aggregate first if possible before reprojecting? For example: One is trying to get two rasters to line up. Using the raster package in R, R1 and R2 can be ...

I have a wide swath raster image. I want to detect cloudy pixels based on criteria such that a pixel in raster layer only consider its 25*25 neighborhood not the entire image. My problem is here that ...

I'm trying to apply a constant slope angle to a raster (DEM) surface. The context is that I'm looking to show a land form upon final completion of works, I've reclassified a number of areas within a ...

I have a raster file featuring sidewalks for an entire city. I created this raster from polygons with the intention of using ArcScan to extract a centerline from the raster. I know that the raster has ...

I have an SRTM-derived hillshade (30x30m) and a Quickbird scene (0.6x0.6m). Is it possible to kind of pan-sharp the hillshade to have the detail but also have the topography?

I am using QGIS v 3.2.1 to convert Raster image to Shapefile Unfortunately the resulting shapefile is upside down. How to keep resulting shapefile right side up Here is animated gif (link on GitHub)...

This is a weird one. I have a user who wants to add a statistical surface to ArcMap and then mouse-over the raster surface and stream those values (z) to a text file. MouseTips can show underlying ...

I have been using the Python GDAL API to read tif raster files as NumPy arrays. Previously, I simply read the raster into an array directly with GDAL: ds = gdal.Open('example.tif') fullarray = np....

I currently have a base raster layer from OSM Standard used in my project. In the regular editing platform for QGIS, the place identifiers for cities are easily readable. However, once I enter layout ...

I have a land use land cover (lulc) raster in WGS84 coordinate system shown below class : RasterLayer dimensions : 59575, 57541, 3428005075 (nrow, ncol, ncell) resolution : 0.000509, 0....

I'm trying to reproject raster layers in QGIS. At the moment they are in ESPG:4326 and I want to convert them to ESPG:54009. (Using Save As... and changing the CRS). However, this produces a layer of ...

I follow http://docs.geotools.org/latest/userguide/library/coverage/pgraster.html to publish a ImageMosaicJDBC layer in geoserver. the layer seems published ok and saved, but the preview of this layer ...

I have downloaded many vector tiles in the mbtiles format from OpenMapTiles. The reason I did that is because I will be using them on a station that cannot have an internet connection at all. I would ...

Say, I have a raster with some annual statistics data. Then Daily avg = Annual / 365 Weekly avg = Annual / 52 Monthly avg = Annual / 12 I know I can do this via Raster calculator in QGIS (v2.18.15)...

library(SPEI) library(raster) Basically, given a monthly time series for two variables a and b as follows: a = array(1:(3*4*12*64),c(3,4,12*64)) a = brick(a) dates=seq(as.Date("1950-01-01"), as....

The raster or shapefile exported from Ecognition does not align with the original raster when I open it in QGIS. I'm using Ecognition to classify a raster, but when I export the shapefile and open it ...

I have this raster (land-and-water.tif): And this one (land-only.tif, black = no data): And I need this (black = no data): I'm trying to do it with GDAL. Here's what I tried so far: gdaltindex ...

I have a set of DEMs that have different extents due to different data being available at each of the sample points these DEMs were generated from. I need to use these to create a set of uniformly ...

I am trying to reproject a raster to the USGS version of the Albers Equal Area Conic projection. Following this post, which talks about projecting vectors by adding the +datum=NAD83 and writing it out,...

I have my definitive raster shown below. This raster has the projection as mentioned here class : RasterLayer dimensions : 7276, 8330, 60609080 (nrow, ncol, ncell) resolution : 463.3127, ...

I have an odd shaped (not square) raster .tiff file that I converted to MrSid using Lizardtech's GeoExpress. It converts the nodata to black. This is applying a value to no data. Eventually I want ...

I have 4 raster images showing different conditions 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 ...

I have found a nice paper about r.diversity extension. But I don't understand why... it returns me empty raster without errors. I have tried to compute diversity on ndvi from spot6 image... r....

I am trying to reclassify a raster, using arcpy in Python. My code is below from osgeo import gdal import arcpy from arcpy import env from arcpy.sa import * raster_file = 'M:/tgopalakrishna\Data\...

Is it possible to invert a slope map same as invert a surface? I found code on this website https://support.esri.com/en/technical-article/000006694 The code is following: (([elevgrd] - Z_Max) * -...

I´m looking for something to help me to make a movie (.avi) out of a series of raster files indicating different years. I´m using soil parameters, so the values are continuous and not discrete.

I received a raster dataset from a colleague consisting of integer values between 1 to 4. The raster displays the correct range of values, but the attribute value contains only a count for values of '...

Below is my code for calculating correlation of geotiffs: library(raster) library(ggplot2) userpath <- "F:\\userpath" r <- raster() A <- stack(list.files(path = userpath, pattern = 'file1*...

I made a PostGIS database where I stored some elevation raster data. Now I want to get the value of a point from the raster for given latitude and longitude. Therefore I printed out the SRID of my ...

I have two raster layers with the same extent, CRS, and resolution, and a shapefile consisting of a number of polygons. I would like to calculate the Pearson correlation between the two rasters within ...

Can someone guide me for applying thresholding technique to input raster image using Python. I intend to extract impervious surfaces from a high resolution raster such as roads, sideways and ...

I have spent quite a lot of time Googling which brought me many places including this site, but I haven't found the resolution. I have a KML that presents a PNG. Radio Mobile generated the files and ...

I am trying to do a lo_export of a raster record in postgis table: SET postgis.gdal_enabled_drivers = 'ENABLE_ALL'; SELECT oid, lowrite(lo_open(oid, 131072), tiff) As num_bytes FROM ( VALUES (...

I'm familiar with a method of exporting everything within a selected feature within Global Mapper using - Export > Export Raster/Image Format. This takes everything within that feature and exports to ...

I use as texture for DEM image with original resolution 4000x4000px. But when qgis2threejs creating 3D model in browser - texture looks like image with low quality. In plugin menu there is line "...

I need to rasterize a part of OSM map by coordinates. I found rather good algorithm, but can’t finish it. I have problems in STEP 3. I described all algorithm here – may be someone have the same task....

I have a set of raster files that are essentially data sets of precipitation across a region. I have multiple raster files that are the outputs of different climate models. Each pixel in the raster ...

I am trying to make a simple flag map of the world. I use raster fill and import an image of the flag, which is a PNG file, and that fills up the polygon of the country. While I can increase and ...

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