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Questions tagged [large-datasets]

difficult to process and manage because the size is usually bigger than the limits software can normally deal with.

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7 views

dotspatial Load in the map from large shapefile with query

Can I load only a little set of data from a large shapefile with a query in dotspatial c#? I think something like "Definition query" of arcmap.
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10 views

Prevent slowing of story map from large data?

I have a building layer that has about 9k polygons and it's slowing my story map. I've tried simplifying the polygon as much as possible, but no luck. Has anyone figured out a method to work with ...
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47 views

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 ...
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23 views

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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1answer
114 views

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 ...
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2answers
87 views

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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44 views

ArcMap fails to convert all records from CSV file using Table to Table geoprocessing tool

I am using the table to table geoprocessing tool to convert a CSV file with nearly 5 million records into an GDB table in a file geodatabase. The tool succeeds each time, but only 603 records are ...
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1answer
170 views

Saving raster to BigTIFF in QGIS?

Using QGIS 3.4, I am trying to merge multiple DEMs downloaded from the National Map Viewer that are in ArcGRID format (Arc/Info Binary Grid). The output will be a large file so I can't use any of the ...
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1answer
2k views

Converting large GeoJSON to shapefile?

I have recently downloaded a building footprint GeoJSON file from Microsoft Bing Maps. The file I downloaded was for the entirety of Texas, and is of approximately 2.2 GB file size. They do not ...
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1answer
25 views

Using “Difference” geoprocessing tool on Big Data taking a very long time

I am using QGIS Bonn 3.2.3. I've recently been using the Difference function to calculate a list of points and it is taking a terribly long time. I was wondering if you could point out any obvious ...
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128 views

GeoServer GetMap with geopackage very slow (with high zoom levels)

I have a GeoServer instance and have imported multiple high res tiff files as layers and created a layergroup from the layers. When I call the WMS endpoint with a specified bbox and the geopackage ...
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0answers
61 views

Improving performance of Eliminate tool in ArcGIS Pro?

My data is very large (polygon feature class with 884187 features), thats why Python geoprocessing tools (which use geoprocesses like Intersect, Buffer etc.) don't work due to performance issues. So ...
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25 views

Working with large dataset with contour lines and possible tiling scheme in ArcMap?

I have a geodatabase feature class comprised of 2' contour lines for all of a county in northern Wisconsin. I also have a shapefile named "...LIDAR_Tile_Index". That shapefile appeared to be a ...
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0answers
101 views

Merging multiple rasters (Very large dataset)

I am working on project to create a DSM raster for whole Kentucky. I will have over 46000 tiff tiles and each one is about 10 Mb and one band. Normally, I use Mosaic to New Raster Tool but this time ...
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67 views

Using Leaflet with large data? [duplicate]

I am looking to display a range of different data geometry (points line, or polygon) within Leaflet. I will be displaying only one dataset (i.e. point, line or polygon) at a time. Some of the data ...
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0answers
33 views

Display big shp files from geoserver on Mapbox [duplicate]

I need to display large SHP files served as tile layers by Geoserver on Mapbox. When my SHP files get bigger, Geoserver crashes cause it's running out of memory. I wasn't working with Geoserver in the ...
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2answers
375 views

Calculating time efficient seasonal means from raster bricks?

I'm starting from a Rasterbrick like that called r.brick: class : RasterBrick dimensions : 17, 19, 323, 21915 (nrow, ncol, ncell, nlayers) resolution : 0.11, 0.11 (x, y) extent : 8....
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1answer
43 views

Are there any continental-scale flow accumulation products besides Hydrosheds?

I am trying to compute branching angles of drainage networks for roughly the western half of the U.S. Because many of these streams are non-perennial (don't have water all year), some of the standard ...
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1answer
327 views

Extract values from large rasterstack, R

I have a large rasterstack of about 500 objects. I want to sample easch object with the use of a SpatialPointDataframe and then export the results as file.csv. I have tried the following but within ...
2
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1answer
81 views

Working with Sentinel-2 data and aggrigation in R

So I was wandering if there is a way to simplify a couple of Sentinel's rasters so I can apply raster analysis on them. Problem is that whenever I try to aggregate the data my RAM, CPU and storage ...
2
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0answers
226 views

Dealing with Very Large Satellite Imagery

I'm curious if anyone has suggestions for viewing and processing really large imagery. I'm pretty experienced with desktop apps like ENVI and am comfortable with python and GDAL but I'm analyzing ...
3
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1answer
200 views

Displaying LiDAR data with too many points in ArcMap?

I have imported LiDAR data into ArcMap in the shape of a Las DataSet with twelve .las files (contains over 100 million data points). I believe the file itself is working properly. However, no points ...
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2answers
340 views

Dice a polygon with over 21 million vertices in ArcMap?

Based on posts like this I suspect I'm bumping up against issues when trying to work with a feature class that contains features with a single very complicated polygon. These errors include 000426, ...
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43 views

Why does myRaster[1] <- 5 takes a very long time for a large raster?

I have a raster, which is not very big, only a few hundred megabytes compressed, but it has about 10 billion values, each stored in 1 byte (0..255). Uncompressed it would take about 10gb (lots of ...
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164 views

Unable to create Cache for Large Vector

I have uploaded a large vector data (20 million records) to Postgres; published the data on Geoserver. But, when I try to create cache for the same it throws GC overhead limit exceeded error. I have ...
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1answer
66 views

Calculate nearest town for 2900 lot centroids

I have 16 town point shapefiles. I have a layer of 2900 centroids for lots. I need to determine the nearest town for each of the centroids. The option I came up with is to Split by Attribute by ...
7
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1answer
775 views

How do you speed up creating new field in attribute table for huge amount of data in QGIS?

In my attribute table for a shapefile, I am converting one field (Julian day) to another field (date) using the field calculator but I'm working with about 7.7 million rows. QGIS has been running for ...
3
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1answer
157 views

How do I calculate the distance between multiple associated points in QGIS?

I have two large lists of points. List A contains the location of a farmers farmstead and list B contains locations of pastures. Both lists have a column that will identify the farmer that the pasture ...
2
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2answers
82 views

How do apps like zillow serve up data?

I'm a total newbie to GIS, but attempting to build an app similar to zillows that quickly serves up data based on user input. Currently, i'm collecting the data via shp files which are being store ...
3
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2answers
176 views

How can I perform a Join by Location for a large vector and very large point file?

I have no programming skills, but am thinking I may need to at least figure out how to run this one script from inside QGIS. I have a vector file of global quarter degree grid cells and a point file ...
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2answers
321 views

Processing a large number of raster files in QGIS

I have a large number (100,000+) of raster files I need to process in QGIS (exporting to tiff, clipping to polygon layers, etc), for a total of approx 500GB. Can anyone advise if there's some way of ...
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1answer
411 views

Joining CSV-Generated Datapoints with Shapefiles in ArcGIS Desktop?

I have a question about joining data points (with a large amount of information) with shapefiles in ArcGIS Desktop: I have imported a CSV file into GIS. This CSV File is quite large: each row ...
2
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1answer
201 views

Split millions of points in shp with 100'000 points each [closed]

I havie over 8 million points in a shapefile. Now I would like to split these 8 mio points into parts of 100'000 points each, in order to facilitate further calculations with these points. In the end ...
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1answer
539 views

Bing maps and large datasets

We were using Bing maps to place pins on a map when a user loads a page. The number of pins has grown significantly so we started to cluster the pins to reduce the load on the client. Now even ...
3
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1answer
171 views

Problems intersecting large polygon shapefiles in QGIS (V2.18.2)

I am using the BirdLife International .gdb file (polygons) of bird species distributions to try and make a species richness map across the Brazilian Amazon. To do this I have clipped the global ...
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2answers
1k views

Showing huge GIS data on map using Leaflet?

I have a huge amount of GIS data in a database. I am fetching this data and converting it into GeoJSON before viewing the map. I am fetching all of the data to meet the requirements, which is taking a ...
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0answers
221 views

QGIS: Raster to vector too large

I am working with a DTM of 5x5m for a large area (already clipped it). I calculated the slopes and want to maintain only the slopes above 2 degrees. I already used the raster calculator to set all ...
2
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1answer
367 views

Loading a large osm file in osmar : why does loading time scale quadratically with file size?

I'm trying to load huge .osm files into R in order to run advanced analysis. I did not expect the loading part to be complex, but it proved difficult. The issue here is that the time it takes to ...
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2answers
1k views

How to efficiently extract time series from a very large multi-band GeoTIFF in R?

First some context: I want to run a time-series analysis function that is only available in R for a continental sized multi-band time-series raster, which is stored in disk in GeoTIFF format, that was ...
3
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1answer
381 views

Importing large .asc files into QGIS

I've been given two .asc files containing a 1m raster data from a LiDAR survey. I only have access to QGIS.2.14.1 (which I'am using for the 1st time only having previous experience with ArcGIS) and I ...
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1answer
185 views

Identifying the closest polygon to a point dataset

I have two large data sets one point and one polygon. What I was looking to do was identify which polygon is closest to each point. Hopefully I was looking for a automated process as the point data ...
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3answers
299 views

Rendering large amount of data in ArcMap? [closed]

Is there a way to load 17 big cadastar plans of urban area in ArcMap and make it "invisible" and use data only when printing to PDF? Total amount of data is too big to work with and I use it only as ...
1
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3answers
1k views

Windows software to convert GeoJSON (> 6Mb) to Excel/CSV?

I am trying to convert OpenStreetmap data GeoJSON to Excel (or .csv files). Few online converters are there. However, when the file is big (example: 6Mb Geojson), the browser is becoming ...
8
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4answers
3k views

Thinning large LiDAR point cloud?

I have a large point cloud (LAS file) and I am trying to thin this using a complex technique. I know it is possible to thin a point cloud using simple techniques such as extracting every nth point. ...
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0answers
66 views

Creating a contiguous raster stack from different sources (vectors and DTM bands)

This is a conceptual question I've been trying to implement for a while, and not being very good at raster/data processing or python I'd like to hear best practices in dealing with an extent such as ...
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2answers
606 views

Splitting vector file by date (year) but column containing dates in Day/Month/Year format?

I am using national accident data in QGIS and quite frankly the dataset is huge as it contains every recorded accident between 2005 and 2014. I've split datasets by field for a number of vector layers....
3
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3answers
841 views

How to find accurate latitudes and longitudes data for cities? [closed]

I want to put the coordinates of cities in a spatial db and then find cities from a given city at some given distance. I am hoping these functions would be readily available in a spatial db like ...
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0answers
471 views

Speeding up ArcGIS arcpy.Merge_management for MANY files? [closed]

I'm currently running a script that is using the arcpy.Merge_management function to merge roughly ~1500 shapefiles together. When I tried this with much smaller test runs, it ran perfectly. Now ...
3
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0answers
875 views

Minidump Error Messages With Large Dataset

I'm using QGIS 2.8 on a system running Windows 8.1 (x64) with 12GB of RAM. I am attempting to run analyses of a very large database (.gdb format, 7.17GB). In attempting to run the "Join attributes by ...
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0answers
367 views

Using gdal_merge to merge a large amount of files (in pairs)

I'm new to python and how it can be applied to gis. I have a large amount of MODIS files to go through and I've already extracted, reprojected and converted to GTiff the bands that I need from each ...