Questions tagged [large-datasets]
difficult to process and manage because the size is usually bigger than the limits software can normally deal with.
131
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How do I make my large raster dataset into a heatmap?
I am trying to create a heatmap from raster data in QGIS. From initial research I understood it that in order to create a heatmap I need to turn my raster into point data first. I have done this with ...
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2
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32
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Interpolating using ArcGIS Pro [closed]
I have 2 datasets. They have exactly the same columns and the data for the second dataset was collected the day after first dataset.
When I perform Diffusion interpolation with barriers on the first ...
- 121
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11
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Fixing self-ring intersection errors in large dataset using QGIS [duplicate]
I am a QGIS user and in the past I was told that I could fix invalid polygons using v.clean.
I am dealing with a huge data set (census tracks) that have some invalid features, due to self-ring ...
- 299
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1
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47
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How to Map.addLayer() rainfall featureCollection over globe using Google Earth Engine?
I am trying to print the precipitation imageCollection allover the whole world but I allways get only a part of the image.
as you see in the image, the north of europe is empty and event when I use ...
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1
answer
32
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sf: Session aborts when reading large geopackage into R
I want to read a geopackage into R that is roughly ~ 600 mb in size.
Every time I want to read it my R-Studio session aborts when doing the
data = read_sf(path_geo)
Is there any "trick" ...
- 685
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9
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Generate Spatial Trajectories within certain bounds
I want to generate a synthetic spatial trajectory data set. These trajectories would idealy be based within a certain area (e.g. Gulf of Oman) and grouped by an identifier.
Idealy for this project I ...
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2
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1
answer
60
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Polygonize large raster to create mask gives memory error
I have a very large land cover/land use raster for South America with dimensions (y: 162565, x: 188387) at the Landsat 30m resolution. I want to use it to mask another raster for the same area at 270m ...
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53
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Computing area of very large feature collection in GEE?
I'm trying to calculate the total area of a very large Feature Collection (over 1 million features) of burned areas over the Amazon. I want to find the total area (sum), and also the area grouped by ...
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2
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34
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What DEM Properties Affect Depression Filling Performance and Results?
In preparing to work with large DEM files, I've been trying to understand the differences between burn, fill, and breach pre-processing methods in terms of the resulting accuracy of stream networks, ...
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2
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1
answer
153
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How to view large data in Google Earth Pro?
I have a dataset with 32,000 location points and I need to view all the points in Google Earth Pro (v. 7.3.4.8248; 64-bit) at the same time. I have tried exporting my data (from R) as a KML and as a ...
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27
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Interpreting an image taken over a one-year period
I found this dataset: Global Aboveground and Belowground Biomass Carbon Density Maps that's supposed to contain data for all 2010, but it actually just contains one image (size is =1).
Should I ...
4
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1
answer
101
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Efficient analysis of large amount of CSV files in QGIS
I have hundreds of CSV files with geometry values in the same folder, and I'm trying to import all into QGIS, and use 'count point in grid' function to see how many of each data on each grid.
I've ...
- 141
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53
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How to build raster file from large folder tiles (256x256), which has 70.000 file tiles
First, I'd like to mention that I'm new to working with GIS, so please forgive my inexperience.
I have map folder with structure: zoom level contains multi tile image files (256x256),ex: folder zoom ...
- 21
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1
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166
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How to handle layer that contains millions of vertices in QGIS
I have a multi polygon layer with 25 features, each containing millions of vertices, holes, etc. It is a statewide floodplain. Right now, it takes forever to draw even when zoomed in, plus the ...
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What is a good way to store a large (tiled) geo raster?
I have a large geotiff raster map (after compression 88 GB) as a series of 919 geotiff-tiles. How can I turn these into a practical file solution (e.g. one file) that allows me to efficiently work ...
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1
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49
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Creating random points using ArcMap
I want to create 100 random datasets in ArcMap for a particular area. Each dataset should contain 10,000 random points. I am using the "Create Random Points" tool in ArcMap.
Can anyone ...
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1
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70
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Calculate NDVI in a large feature [closed]
I'm having some trouble with my GEE script. I have to calculate NDVI of each feature of my shapefile, but it is too large. Someone could help me with this code? I think it's king of simple, but I'm ...
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3
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89
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Count how many new points are captured when a polygon buffers by x miles
I have a polygon and a layer of many points. How many more points would be captured if I expanded the polygon by x meters? I want to end up with values for x = 1 mile, 5 miles, 10 miles, and maybe a ...
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4
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1
answer
341
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Using PostGIS to find the overall difference between two (large) polygon datasets
I need to get the Difference of an input layer with ~30k polygons and an overlay layer with ~500k polygons (of which ~200k intersect the input layer).
I am trying to learn PostGIS to do this, as it ...
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123
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PostGIS: Using ST_CoveredBy (or similar) to speed up Difference on large datasets?
I need to get the Difference of a single large-area polygon (input layer) and a very numerous set of polygons (overlay layer). The overlay layer has ~500k polygons, of which ~200k intersect the input ...
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1
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144
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What is the canonical way to perform raster calculations using R stars?
I have a data cube that I am handling in the R stars package. It has 3 dimensions (latitude, longitude and time) and 2 attributes (northwards and eastwards components of wind). A dummy equivalent ...
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45
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GEE large export of pixels using shapefile polygons: Is it possible to automate a division of the polygons asset?
I need to export pixels from a processed image of Sentinel-2 using GEE Javascript with a 10 pixel size. The export is for pixels within 120,000 land parcel polygons.
I am way above the limit for pixel ...
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1
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287
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Leaflet - remove data from layer?
I have a quite complex webapp with a lot of data on a map. Except the basemap, the data of each layers are coming from AJAX queries, witch's responses are formatted as GeoJSON object -- up to this ...
- 121
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41
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How to calculate and store (ArcMap) slope on huge mosaic dataset?
I have a huge raster dataset stored in a geoDB (DHM with 2m resolution for all of Switzerland), uncompressed size ~75 GB. I want to use the ArcMap Slope tool (or another tool would also work) to ...
- 1,241
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1
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216
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How to normalize a large point cloud using lasheight and a .tif DTM?
I am normalizing a large point cloud (>16 GB), for which I'm using a preprocessed DTM that I store as .tif.
For smaller amounts of data, I would use an R script that lets me do this:
library(lidR)
...
- 1,241
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0
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816
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Export large area data in Google Earth Engine
I am trying to average an image collection from 2019-02-01" to "2019-02-28 on Earth Engine platform. My goal is to export the data in Google Drive that I can use it in QGIS for other ...
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3
votes
1
answer
274
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Intersecting large shapefiles onto grid in QGIS
I have 21 separate shapefiles containing data for Ireland as various
polygons on QGIS 3.10. I'm trying to intersect each shapefile onto a
250m² grid of Ireland so that I'll have 21 separate shapefiles ...
- 31
2
votes
2
answers
152
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Zonal statistics USFS tree cover by census block
I want average tree cover for every census block. I have a file of census blocks, and I have a USFS tree cover file from USFS Tree Canopy Cover Datasets that looks like this:
I'm trying to use zonal ...
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3
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2
answers
250
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gdal_calc raster calculation fails on 28 GB GeoTiff
I am trying to do a raster calculations on a 28 GB GeoTiff using gdal_calc.py (3.0.4) but the process fails
gdal_calc.py -A DEM_0.tif --outfile=DEM_1.tif --calc="A+0.33" --format=GTiff --...
- 71
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1
answer
99
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Large-scale cloud masking, grouping and mosaic in Descartes Labs platform
I am looking to create a stack of cloud-free sentinel-2 imagery by day for a large portion of California for all of 2020 in the Descartes Lab platform. I realize that this is a very large amount of ...
1
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1
answer
679
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Google Earth Engine: Error exporting a large Feature Collection to CSV
On GEE, I want to export daily weather variables for 18 years for about 30,000 rectangular polygons. That would be exporting a FeatureCollection to a csv file with ~200 million rows (30000 places * ...
- 111
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197
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Generate synthetic trajectory dataset that has global coverage
I want to generate a spatial trajectory dataset which basically contains tuples - (lat,lon,time), grouped together by an identifier so they form trajectories. In addition, I want this dataset to have ...
- 572
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113
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Georeferencing larger GeoTIFF's in QGIS
I have a GeoTiff (>100GB) and I want to georeference it in QGIS using the georeferencer option. I did manage to create the GCP's (>15) but when the georeferencing is set to run, it crashed mid-way. ...
4
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1
answer
895
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Calculating max shardSize and fileDimensions to avoid tiling large raster exports in Earth Engine
I am exporting a very large raster in Google Earth Engine to my Google Drive. I am trying to keep my exported raster to 1 file to avoid additional processing to merge the tiles (e.g. GDAL merge in ...
- 97
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1
answer
913
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Exporting large rasters in Google Earth Engine
When exporting large raster data in Google Earth Engine to your Google Drive, is there a function that prevents the export from automatically tiling into smaller files, or even decreases the number of ...
- 97
3
votes
2
answers
789
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Publishing a large and complex map to the web
I have created a complex map of my area and I wish to publish it as an interactive map on the web. The dataset appears to be too large for QGIS2Web to work - the script completes eventually but in ...
- 379
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2
answers
290
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Heatmap of a large polyline dataset in QGIS
To summarize: I'm having difficulties with creating a heatmap from a large (90021-item) polyline dataset in QGIS 3.10.1.
First, it is worth noting that this question is somewhat similar to Doing ...
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3
votes
1
answer
102
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Merging and snapping shapefiles
I have several large shapefiles from various sources. All cover various sections of oceans and many overlaps, as such the coastline is repeated across the several shapefiles but to varying levels of ...
- 133
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1
answer
351
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Serving large (1.7Tb) dataset of aerial images with GeoServer
I have a large dataset of aerial images consisting of 8000 TIFFs where single images are no larger than 0.5G and all have have .ovr pyramid files with them.
Previously I have served this dataset as ...
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4
votes
4
answers
3k
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Convert large OSM files to GeoJSON
I have been trying to convert a large OSM file (5G) to the GeoJSON format. All the tools I have been using, use extensive memory and throw an out of memory exception.
What is the best way to convert ...
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130
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Leaflet: Load GeoJSON point data in polygon, when selecting polygon
I've got a point dataset (~ 160.000 points) which has a filesize of around 30 MB. Because that is too large I decided to slit it into 12 separate GeoJSON files. I've got a map with 12 polygons. When ...
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1
answer
33
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Creating a layer with selected values (divided by commas) from another layer - query or model needed
I have a very large dataset in ArcMap 10.6 and I would like to create a subset that selects only rows that have specific attributes (some of them with special characters) from a field that in my case ...
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1
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115
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Extracting or masking of very large raster to reduce file size on disk?
I have a very large 8-band raster (339806 x 61704) that I cannot load to memory to manipulate (R, raster:canProcessInMemory indicates I need 4999.16 GB of ram to load this file). However, I only need ...
- 11
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votes
1
answer
85
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Counting points contained in polygon for large number of points in ArcMap?
I'm trying to determine the number of points within a set of polygons for a large number of points. There are 2GB of lat-long coordinates in a CSV file, and I want to see how many are contained in ...
0
votes
1
answer
298
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Reduce processing time for large GeoTIFF image
I am trying to process large GeoTIFF images (128 MB) using GeoTIFF reader provided by Geotools library. However the processing time is very high, can anyone suggest how to reduce this time.
Normal ...
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1
vote
1
answer
120
views
Why does geodataframe never complete?
I had a feature class made up of 1,700,000 polygons. I used Geopandas to create a geodataframe:
state = "MD"
state_gdb = r"C:\Projects\Pop_Alloc\{}_Data.gdb".format(state)
join_feat = "{}...
- 1,679
1
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answers
112
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R process: Zonal Stat Raster has No Data Values vs Arc output
I am trying to re-create my ArcGIS Zonal Stat model with R
All my files will be 30m pixels; 18000 x 18000.
I have used R two different ways to create the output and both create NoData values in the ...
- 92
0
votes
0
answers
32
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Union very large layer in FGDB and only keep one polygon that is overlapping?
I'm trying to union an exceptionally large layer (45k features) of footprints with many of them largely overlapping. I'd like to union this layer but I'm having trouble due to the size of it. The end ...
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2
votes
1
answer
1k
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How to snap to a geojson-vt layer (Vector Tile Layer)?
I'm using geojson-vt to render a large geojson (originated from OSM) file. This file contains all road from a state (extracted with overpass-turbo way[highway="*"]). I'm buinding a domain-specific ...
3
votes
2
answers
321
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Script I made for pyQgis runs slow but can't find another way around it
registry = QgsProject.instance()
first_layer = registry.mapLayersByName('buffered')[0]
second_layer = registry.mapLayersByName('buffered')[0]
areas = []
instrument_number = "tin_ttl_in"
proprietor =...
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