Questions tagged [extract]

To obtain a subset of a spatial object, by means of some logic or query

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21 views

Extracting geometry from feature collection in Earth Engine [closed]

I have a feature collection containing thousands of feature. They are categorized into 10 classes. As you can see in the picture, these features are spread irregularly. I need to merge their ...
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1answer
66 views

Extracting peaks and cols from a DTM raster and convert them into point shapefiles (QGIS)

I’m trying (again) to find an automatic way to extract peaks and cols from a DTM raster (derived from LiDAR surveys). By “peak” I mean simply the cell with the highest value of a neighbour of cells; ...
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18 views

Extracting average value at point using ArcGIS Pro

I have a dataset of over 500 points that represent the location of a number of site boundaries and a Tif file displaying the wind speed data over the study area. Is it possible using ArcGIS Pro to ...
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18 views

Problem with Data Interoperability FME.exe some layers from GDB failed through extract data tool processing

I have ArcGIS Server 10.7.1 and using Data Interoperability tool for extract data from SDE DB to GML format. After process is starting there is a lot of fme.exe in processes on the server. Memory is ...
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1answer
41 views

Extract one band from a multispectral raster PyQGIS

I want to extract red band, from a multispectral raster with 5 band, using PyQGIS. I tried this code, using the GDAL rastercalculator. I tried to extract the 3 bands, and then calculate my index. ...
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2answers
103 views

Multiple extract by attribute using PyQGIS

I am trying to extract only three polygons from my attribute table from a vector layer. The column which contains the values I want is called "ID". import processing layer = r'C:\mypath....\...
7
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1answer
102 views

Extracting pixels from a raster based on a given tolerance value as in Photoshop

I'm new with raster in QGIS. I have a three-band (RGB) georeferenced raster similar to this: (Reference) And I would like to extract the pixels with similar color like in the following image by given ...
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2answers
63 views

Extracting polygons from scanned GeoRef images based on colours in QGIS

I would like to extract a polygon based on it's colour from a scanned map georeferenced in QGIS. In the image, I would like to extract all of the blue as a separate shapefile/GeoPackage instead of ...
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1answer
78 views

Google Earth Engine extract values on MODIS data at point coordinates

I'm trying to extract from the MODIS collection MOD11A1006 band "LST_Day_1km" at one point coordinates the value of each image in the collection together with the date, and hour of the image ...
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3answers
78 views

Extracting overlapping polygons within same layer in QGIS

I want to extract all overlapping areas in the same polygon layer, where borders from e.g. area 1 and area 2 (picture) overlap. I have tried "intersection" with the same layer as input and ...
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40 views

Extract shapefile from scanned PDF map using Open Street Map?

I am new to QGIS. I have a scanned PDF document containing maps of the Italian highway network development year by year from the 1920s to the 1990s (i.e. showing the pre-existent network in a given ...
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2answers
78 views

Inserting words from field into new column in QGIS

Is there any good expression to extract the first word of a field and put it into a new column? I would like to create a new column without the numeric values and filter out words that are doubled. ...
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1answer
48 views

Extract data from OSM

I would like to extract all the data that is coloured blue (water) from OSM for England. I'm doing this as I need a poylgon of the extents of inland waterways (Ordnance Survey don't hold this data). ...
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1answer
38 views

Extracting all polygons from GeoTIFF raster layer as PNG images using QGIS

I have a GeoTIFF file with multiple separated polygons on it as the following: I'd like to find a way of extracting all these polygons as separated individual PNG images, just so I can have them as ...
3
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1answer
82 views

Is it possible to extract tiles layer as raster in QGIS?

Let's say I have a shapefile that contains multiple polygons and I open it on QGIS: Let's also say that I activate the OpenStreetMap tiles layer under it: I'd like to find a way to extract the tiles ...
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76 views

Using OSMOSIS to extract multipolygon data from .pbf file

To update my database I need to extract some data from the OSM database. To do it I have downloaded the osm *.pbf file from the website of GEOFABRIK. From this PBF file I wish to extract all the ...
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89 views

Counting pixels of each land cover type within each polygon from raster image using R

I have the following raster image that shows the different types of land covers on the island of Maui (there are 22 in total): The island is divided into "mokus" or large districts, which ...
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1answer
48 views

Extract Max or Min Value from Point File Attribute and then Add XY Coordinate

I have created a Point dataset by using the Saga routine 'Convert Lines to Points'. This produces the following look and attribute table: Can anyone advise on how I can extract the maximum value from ...
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1answer
65 views

Extracting points as KML/KMZ from web map

This is the link: https://www.hopenvios.com.ar/. I would like to have the map with all points, does anyone know if it is possible?
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2answers
248 views

Read multiple layers raster from ncdf file using terra package

I want to read a specific layer from a multilayer raster (format ncdf) using terra package. I want to extract each layer by polygon using terra package (it is a very fast way to extract values). I ...
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1answer
87 views

Counting points within polygon and extracting the data

I have been given a CSV file which contains the Longitude and Latitude data points for a number of mobiles that run our own internal app. The data includes the unique "ID" for the device ...
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1answer
55 views

Extracting polygons with smaller polygons inside parcels with houses

I have cadastral map loaded as a pink vector layer in QGIS. Then I have another vector layer that contains residential houses (purple polygons). I would like to create a new layer with areas ...
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1answer
143 views

Extracting min max values of all bands in Google Earth Engine

I want to extract minimum and maximum values for all the bands in an image here is my code: https://code.earthengine.google.com/8edcbe3386ba6e639dec363e3af0eb38 Map.setOptions('HYBRID'); //Get ...
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1answer
232 views

Clipping/extracting raster from loaded XYZ Tiles basemaps (e.g. Google Satellite)

Is there anyway to clip/extract raster from a loaded XYZ Tiles basemap? I am trying to use Google Satellite imagery, but every time I use the Clip Raster by Extent GDAL tool, I get an error. I am ...
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1answer
34 views

Extracted XYZ/WMTS/REST Rasters from USGS and ArcGIS Online Not Rendering

I'm not a regular GIS user. I'm trying to extract (save for offline use) topographic maps from a couple different sources, but when I load the extracted file, it's either gray with a pattern of white ...
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2answers
89 views

Losing CRS definition saving to GeoPackage with PyQGIS

I'm using PyQGIS to run the processing algorithm "qgis:extractbyextent". The algorithm runs in a for loop using the current extent to perform the clip. Saving the OUTPUT to memory works fine ...
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2answers
39 views

Extract pixel values and its category using R

I've been using this script for a long time. This code creates a DataFrame that contains the pixel values of each band of a RasterStack that overlaps with a SpatialPolygonDataFrame or a ...
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1answer
175 views

Zonal statistics in R: using exactextractr to extract the counts of a range of pixel values from a raster

I have a raster with pixel values from 0 to 20, and I'm trying to count each pixel value with R package exactextractr. I have the raster ('def'), a SpatialPolygons object ('grid10') and an empty ...
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1answer
46 views

Extracting all possible polygons from set of different types of geometrical elements

I have an input, a set of different types of 2D geometrical elements with all its attributes (arcs, circles, lines, polylines, rectangles, polygons..). These elements can be connected end to end, ...
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1answer
72 views

Landsat 8 Surface Reflectance Values extracted from QGIS and Google Earth Engine

A friend and I are working with remotely sensed imagery and need to extract surface reflectance values for a specific set of points. I did so using QGIS and he did using Google Earth Engine, but our ...
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75 views

Extracting elevation value (z-value) from 3D polygon at given point with QGIS

I am working with surfaces that limit the growth of buildings or structures near airports, for this I have modeled a series of regulatory surfaces that define the maximum permissible limit that an ...
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46 views

Extracting XY coordinates from dynamic web map

I am trying to extract XY coordinates/georeference points from a dynamic web map (specifically electric vehicle charging stations). I basically want to download/extract the location of the charging ...
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1answer
53 views

QGIS extract by attribute but different

I've got a Layer where old data versions are still in the layer. We've got the field "name" and the field "Version". The problem is that not every Name gets a new Version at the ...
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1answer
208 views

R - extract() function - buffer option not working

I'm trying to extract a mean value from multiple pixels of raster file "r" for a vector shapefile "v", by using the r extract function (see ?raster::extract) Since some of the ...
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1answer
98 views

How to properly extract point data from multi-raster grib file in R? [closed]

I am trying to extract point data from grib files found at https://nomads.ncep.noaa.gov/pub/data/nccf/com/hrrr/prod/hrrr.20210511/conus/. These files consist of 170 or 173 layers (variables). I want ...
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38 views

Export spatial data from Web Map

I am trying to get the polygon data from the following leaflet web map http://www.cityfibre.com/rollout/. I am not really sure what kind of format I should be looking for (geojson, xml, etc..) but I ...
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1answer
65 views

Extracting data from attribute table in one shapefile and use it to populate another shapefile attribute table using ArcPy

I am working on a homework assignment for my coding class, and I am having issues with the last part of the assignment. My job is to create new three shapefiles based on players' positions in a target ...
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1answer
219 views

Extracting values from Corine Land Cover (CLC) 2018 raster using R

I would like to extract values from Corine Land Cover (CLC) 2018 raster. library(sp) library(rgdal) library(raster) r <- raster('U2018_CLC2018_V2020_20u1.tif') #Warning message: #In showSRID(...
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29 views

Error: Transforming SpatialPolygons to the CRS of the Raster

I want to get the mean of all raster cells in each part of a polygon but I am getting a warning message. My code is: rain <- readOGR(dsn="/Users___.shp", layer="rain") class(...
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1answer
139 views

Trying to extract xyz from multipolygon shapefile

I want to extract the x, y and z from shapefile polygon vertices where the geometry is multipolygon. Once extracted would like to have them in a geopandas data frame. I have seen a couple of ...
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3answers
142 views

Extracting polygons from layer crossed by lines layer

I'm looking for a way to only select entities crossed by a lines layer from a polygons layer. I've unsuccessfully tried the Intersect function with lines layer overlay. I'm mentioning that I have used ...
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42 views

Extracting value of Landsat Band 8 at given location in Google Earth Engine

I would like to have the value of the B8 of Landsat at a given location pt as an output but I keep on getting errors. I think I confused some values but cannot find the mistake. My code is below. // ...
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65 views

Focal operations / aggregations on stars_proxy object in R

I have many NetCDF-files that I read in as stars_proxy-object. I also have a geopackage that is a multipolygon. I Would not like to extract the mean value for each polygon for each stars_proxy-object. ...
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80 views

Fast_extract with velox archieved in R

I am new to how to manipulate spatial data, so unfortunately after finding the command I want to use which is fast_extract as the following: rs <- fast_extract(rd, county, velox = TRUE, fun = mean, ...
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1answer
204 views

Merging XY coordinate table to shapefile data using ArcGIS Pro

I am new to ArcGIS Pro. My situation is as follows: I have a shapefile that contains some data for some variables for different block groups. What I require is the data for those variables for some ...
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97 views

Extracting data from a .mat file with numpy and a mask

I have the output of a xBeach model run in .mat format. There are several layers that represent the sea status for each time-step. In each layer there are the coordinates and the water level of the ...
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92 views

Extracting values from soilgrid layers for xy coordinates in QGIS

I want to extract soil values for a list of x and y coordinates from Soilgrids layers in QGIS. I loaded some layers through the browser (WMS) as a test, and then selected the specific layer (e.g. Soil ...
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1answer
123 views

How can I extract Moran's I from buffered pixels withins raster

I have a raster with NDVI and I have a dataframe with coordinates I want to extract stats from at a 125m radius. extract(NDVI,coordinates,method='simple',buffer=125,fun=mean) this works for most of ...
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2answers
609 views

Fastest way to perform focal operations using R

I know there are already some questions out there discussing this issue, for example: How parallelize the extract function for raster files in R? Increasing speed of crop, mask, & extract raster ...
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84 views

GEE Python API Resample Image Collection from 3 hr to 1 day temporal resolution

Is there a way to resample an image collection to a different temporal resolution in GEE? I am extracting points from several bands in the GLDAS asset, which has a 3hr temporal resolution. I have a ...

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