Questions tagged [large-datasets]
difficult to process and manage because the size is usually bigger than the limits software can normally deal with.
138 questions
1
vote
0
answers
34
views
terra package "intersect" aborts R session, "aggregate" takes forever
I am using package terra to work with one SpatVector Object1 that is lon/lat WGS 84 and spans Central America from southern Mexico to Darien. The object has 2,892,488 geometries which delimit patches ...
- 11
4
votes
1
answer
132
views
Merging PostGIS tables with billions of rows
I'm trying to create a unified high population density dataset using the Facebook "data for good" dataset. Currently their dataset is available as a raster or CSV per catagory (men, women, ...
- 1,653
0
votes
0
answers
20
views
Trying to export a time series of EVI values for a large asset in Google Earth Engine
I'm trying to export a time series of EVI data for a large asset containing 40,000 points. I am using the MODIS data. The code that I've written works when I extract data for 5 points, but it's not ...
- 1
1
vote
0
answers
28
views
rasterio._err.CPLE_OutOfMemoryError: /io/gdal-3.6.4/frmts/mem/memdataset.cpp when trying to create a new large rasterfile
I am trying to step by step save a lot of data in a single GeoTiff file but rasterio seems to fail right away when I try to open the file I want to write my data to due to my available RAM not being ...
- 11
2
votes
1
answer
114
views
Get the outline of badly optimized polygons (too many vertices?)
I'm trying to get the area of some flooding data. Overall, the dataset is huge and hardly to handle in QGIS. The dataset comes in several shapefiles ranging from 60 Mb to 4 Gb and include several ...
- 21
0
votes
0
answers
54
views
Issues Opening Large DTM File in QGIS - ‘Bad Allocation’, 'Error occurred while parsing element at line 1 column 1' Error
I’m trying to open a large DTM file in QGIS but I’m encountering errors. The data is a DTM 5x5 m map of the Lombardia region. The .ige file is 7.7 GB and the .img file is only 522 KB.
I’ve tried ...
- 1
0
votes
0
answers
355
views
Speed up loading large GeoJSON layers to Leaflet map?
I have some GeoJSON data layers which I fetch their features from phpMyAdmin to display on a Leaflet map.
But loading the features takes almost 10 seconds to be loaded.
Have you any solution to speed ...
- 149
4
votes
2
answers
1k
views
Data too huge to access: Bing Australia Building Footprints
I am relatively inexperienced with QGIS. I seeking to access building footprints in a 20km radius from the centre of Melbourne city, Australia.
The dataset I am hoping to use is Bing's 2020 Australia ...
- 51
0
votes
1
answer
888
views
Using sf package for R to calculate distances for large dataset of location pairs
Working with data set of about 84k location pairs and trying to run in same manner as example code below. Getting results where distances are returned in an object of n x n dimension so when run on ...
- 1
2
votes
0
answers
847
views
Exporting large attribute table from QGIS to Excel
I am working on a project with an attribute table of approx. 5,564,098 rows. I've tried exporting it to Excel using the "save as" CSV or XLS but the data keeps getting cut off. I would ...
- 21
1
vote
1
answer
431
views
Google Earth Engine: how to export large image as one image not tiles
I want to download sentinel5 data for no2 for Saudi Arabia the whole country.
This is my code:
var collection = ee.ImageCollection('COPERNICUS/S5P/OFFL/L3_NO2')
.select('NO2_column_number_density')
...
0
votes
1
answer
239
views
Tessellation on huge dataset
I have a set of CSV files with lat/long for points spaced every 500 meters apart. There are several files that collectively span a huge area across the Nevada/Utah border.
I need to create a ...
- 950
-1
votes
2
answers
106
views
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
0
votes
1
answer
161
views
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 ...
0
votes
1
answer
509
views
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" ...
- 1,379
2
votes
1
answer
444
views
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 ...
- 23
0
votes
0
answers
558
views
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 ...
- 93
2
votes
0
answers
154
views
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, ...
- 21
2
votes
2
answers
2k
views
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 ...
- 235
0
votes
1
answer
32
views
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
votes
1
answer
208
views
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 ...
- 375
2
votes
0
answers
245
views
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
0
votes
1
answer
848
views
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 ...
- 1,830
1
vote
0
answers
104
views
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 ...
- 2,554
2
votes
1
answer
71
views
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 ...
- 115
-1
votes
1
answer
148
views
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 ...
1
vote
3
answers
115
views
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 ...
- 47
4
votes
1
answer
1k
views
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 ...
- 175
2
votes
0
answers
336
views
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 ...
- 175
3
votes
2
answers
648
views
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 ...
- 151
1
vote
0
answers
139
views
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 ...
- 23
2
votes
1
answer
994
views
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 ...
- 161
0
votes
0
answers
77
views
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 ...
- 2,554
0
votes
1
answer
522
views
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)
...
- 2,554
-1
votes
1
answer
2k
views
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 ...
- 47
3
votes
1
answer
623
views
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
250
views
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 ...
- 449
3
votes
2
answers
491
views
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
0
votes
1
answer
133
views
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
vote
1
answer
1k
views
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
1
vote
0
answers
355
views
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 ...
- 662
4
votes
2
answers
2k
views
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 ...
- 107
0
votes
2
answers
2k
views
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 ...
- 107
3
votes
2
answers
1k
views
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 ...
- 471
1
vote
2
answers
628
views
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 ...
- 146
3
votes
1
answer
156
views
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 ...
- 153
0
votes
1
answer
862
views
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 ...
- 51
7
votes
4
answers
7k
views
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 ...
- 113
1
vote
0
answers
262
views
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 ...
- 21
0
votes
1
answer
35
views
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 ...
- 33