Performance concerns how effectively a computing system uses resources.

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Building Large Network Datasets from OpenStreetMap in ArcGIS?

I'm trying to build a "large" network dataset from OSM data in ArcGIS. Doing it all at once is taking a "long time" and seems like there is a big opportunity for it to fail at some point which would ...
3
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3answers
93 views

Spatial join with HUGE datasets

How to make a spatial join with ArcGIS with these HUGE datasets? Target: almost 3 million squares 500x500m size (the attribute table is basically empty) Join feature: 12000 polylines Operation: one ...
3
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1answer
145 views

Map-server Very Weak Performance Vs Geo Server - Why?

I search for a good wms server that support Postgis at the end I found Mapserver as the fastest and best choice. Every performance test say it's faster than Geoserver because of its native compiled ...
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0answers
33 views

What is the fastest way to select oldest, unique geometry from a table containing duplicates in PostGIS?

I have an output from an ArcPy arcpy.Union_analysis operation and for the overlap polygons that were created I need to select out the oldest feature (along with the attributes). The result is 75740 ...
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0answers
65 views

Understanding Number of Feature Classes vs Connection Time with Enterprise Geodatabases

So here's the situation - at the moment I am having a problem where the more feature classes I load into a ArcGIS 10.2 enterprise geodatabase in PostgreSQL, the slower the connection time becomes. I ...
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0answers
53 views

ArcPy reading a raster in a moving window?

I typically read large raster data using gdal and setting up a moving window of 256*256 pixels (for example). I recently had to do some processing using arcpy, so I did the same thing, using ...
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2answers
176 views

Fastest way to numerate intersecting polygons in ArcGIS

I need to numerate a thousands of polygons in groups, so each group will get unique number. Every intersecting polygons is unique group (see picture). So polygons have field "groups" with values: ...
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4answers
170 views

Is there a site with templates for Arcpy where I can just fill in the blanks?

I have a Shapefile containing near 7000 pour points across the globe (GCS, WGS84). I'm using the following model to select the first feature point of the Shapefile, copy the selected feature in a new ...
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31 views

How to Make Model with Iterate selected feature run faster?

This question is related to this one : Model with Iterate selected feature not working. What's my mistake? The answer provided by worked great, but it’s really slow. Any way to make it run faster? ...
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0answers
58 views

What is the reason for the very poor performance of ESRI's file geodatabases on network drives?

I am asking this question because I am at a loss and dont have a good enough understanding of all the underlying operations going on 'under the hood' of Windows/Arcgis. What is the root cause of ...
3
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1answer
73 views

Is there a way to reduce tile processing from Openlayers 3 when user pan & zoom a lot?

I have 2 overlays with local tiles (xyz) on my map. When the user zoom in / out and pan the map intentionally a lot, the app becomes very slow because OL tries to render all the tiles it was requested ...
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0answers
22 views

Making Tile Service fast in ArcGIS Server for Silverlight Viewer?

I am publishing a tile service in ArcGIS Server but when I call it in ArcGIS Silverlight Viewer it took a lot of time to open completely, and panning is very slow. What should I do to make my app ...
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8 views

Performance: Reproject Cache vs. Drawing Vector data in correct projection

I have quite a bit of data that I am caching from UTM to Web Mercator. This is fine, but I have another process that automatically creates map book pdfs. These map books have been setup to read the ...
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1answer
52 views

Georeferencing CAD drawings

I am trying to Georeference CAD Drawing in ArcMap by adding the Control Points. But it is taking a long time to load the CAD file. I could not do snapping and every time I hover over the mouse, it ...
2
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2answers
86 views

Why the execution of a query is very slow using PostGis?

I'm applying this Query to 8257800 point but it's taking 15 hours and it didn't return a results. SELECT a.gid , b.gid, st_distance(a.geom,b.geom) FROM shp1 a, shp2 b where ...
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1answer
43 views

Taking a long time to load tables from oracle to QGIS

My workplace has an oracle database with a very large number of spatial tables. Therefore, it takes a long time to load the oracle connection in QGIS. Does anyone know how this could be speed up?
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22 views

Spatial filter taken more time for running any other way to improve speed

I had number of buildings in data (around 600000) i want to check if any building captured less than shape area 25sqm should snap to existing building. i have used spatial filter but it is taken more ...
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2answers
144 views

Efficient ways to read table data from a large feature layer?

I have a feature layer that contains about 460,000 records and it currently takes about 20 minutes to read that table using the arcpy.da.TableToNumPyArray() tool. Is there a more efficient way to read ...
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1answer
71 views

Is there a way to improve the time for opening a QGIS project?

We have a QGIS project using postgresql database "made with" osm2pgsql. The database is about 68GB. Our Configuration is : AMD-FX 8 cores @ 4.7Ghz 32 Gb RAM 500 Gb SSD (read/write 600Mb/s) Ubuntu ...
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0answers
15 views

Improving Global Scene transition when changing location using bookmarks in ArcGIS Pro?

Using ArcGIS Pro 1.0.0 I have: Created a new project using Global Scene.aptx Switched the Basemap to National Geographic Navigated to and created Bookmarks for some countries of different sizes: ...
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1answer
25 views

How to make Feature to Raster tool run faster

Suppose you have a feature class that you need to convert to a very detailed raster (where each cell size is quite small). With a cell size of 0.0092908447 in the Feature to Raster tool, the procedure ...
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58 views

Lizmap recommended layer settings for performance (faster navigation)

I am currently using Lizmap and I really love it. There are a great bunch of options available which makes it pretty customizable. The only "but" I can mention is speed. My map seems to be loading ...
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1answer
54 views

Performance is downgrading with multiple feature datasets design for ArcGIS?

My company develops a spatial planning solution since 2009. Initially it was an ArcMap application to create and maintain spatial plans (competing with AutoCAD folks) but recently we developed ...
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0answers
69 views

Why is SAGA kriging slower in QGIS than in SAGA itself?

I'm using QGIS for a while. In my opinion the SAGA kriging tool (processing toolbox) is very slow. Is that an QGIS issue? I tried to interpolate a point layer with 300.000 points (I know it is big) ...
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2answers
98 views

Performance Monitor of ArcGIS for Desktop?

Is there a way/tool that could basically report what ArcMap 10.2 is doing? I can't really explain it, so I will show you what I mean. Now mind you it doesn't have to be exactly like this. ARCMAP ...
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1answer
126 views

How can I speed up a slow ArcGIS Server 10.2 - PostgreSQL (9.2) ST_Intersects query?

I am troubleshooting a slow st_geometry query in Postgres 9.2 that uses ST_Intersects--a basic Select from table where ST_Intersects type query. table_extent ...
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0answers
43 views

Mapnik performance - large polyline dataset

I'm working with a very large set of polylines - contour data - to be rendered with Mapnik. (The contours are generated using gdal_contour from SRTM data.) At present I'm storing them in PostGIS and ...
0
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1answer
56 views

Display more than 1000 lines on web map

I've a scenario that I need to display many lines on the map (for instance all road links of Manchester in UK). I am using Leaflet as map plugin. I use geoJSON as source of data, when I try to load ...
3
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0answers
100 views

Performance difference between focal statistics (ArcGIS) and neighbor (GRAS or QGIS)

I tested minimum, maximum, and average neighbor (circle radius = 161 pixel) using ArcGIS, GRASS and QGIS: ArcGIS (10.1): it takes only one minute GRASS (6.4.3): it takes 123 minutes for every output ...
4
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1answer
92 views

PostGIS: Strategy for fastest select by BBox with an ORDER BY polygon area clause. Cluster?

Update 2 (below) suggests 14% of the table geometries are stored out-of-line with the rest of the table records. This may be a useful clue. The Problem: We've got a table with appx 170,000 WGS84 ...
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1answer
78 views

How to reduce Overpass way QL statement output to just tags?

I am new to Overpass API. Ran this query [way(around:10.0,37.559391,-122.301529);out;] in overpass-turbo.eu and getting lot of information about nodes. I just need to know whether it is valid way or ...
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1answer
54 views

ogr2ogr Spatialite to csv very slow

I am using ogr2ogr to extract point data from a Spatialite db to a csv file:- ogr2ogr -f "CSV" commandtmp.csv dtm2.sqlite -lco GEOMETRY=AS_XYZ -progress -explodecollections the Spatialite db is 7GB ...
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0answers
96 views

Spatial query by ESRI ST_Geometry take too long

I am using ESRI ST_Geometry in my application, and I found that the spatial query is rather slow: The following sql is used for query pois inside a certain bounding_box: select * from ( select ...
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0answers
47 views

Showing large number of polygons in SpatiaLite on Android map?

I have 2,300 complex multipolygon features in an offline SpatiaLite database. How can I show them on an Android map without slowing the map to a halt?
1
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1answer
440 views

How to improve ArcGIS Desktop 10.2.2 and Postgres 9.2 PostGIS geometry performance?

I'm experiencing sever performance issues on a polygon featureclass(PG_GEOMETRY) in a PostgreSQL 9.2 database from a 10.2.2 client. Even when zoomed to an area with 10-20 features within the extent. ...
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1answer
68 views

SQL query within Select tool in ArcGIS model going very slow

I have been working on finding the shortest routes from a series of residential blocks (a shapefile with polygon centroids) to a a number of recreational areas. I have a total of 9 resulting OD cost ...
1
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1answer
23 views

Avoid sending CSS with each search in CartoDB

We’re developing a project with CartoDB and we want to show each element with a custom image. We are doing this setting the sublayer.setCartoCSS() with something like this: cartocss: "#map { (…) } ...
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1answer
153 views

GeoTIFFS on Geoserver are served slowly, at too low resolution

I have a bunch of large, high resolution GeoTIFFs, that I am serving using GeoServer. I also have a prototype client I wrote using Leaflet. The resolution of the TIFFs is quite high, but despite that ...
2
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0answers
56 views

QGIS extremely slow to clip vrt on Mac

I've been using QGIS 2.6 (Brighton) happily for awhile but suddenly it became extremely slow during certain operations, after being reasonably fast in past use. I'm merging NAIP JP2 files to virtual ...
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0answers
49 views

Performance problem WMS layers arcgis Server

I am learning to work with ArcGIS for server and with Javascript, HTML5 and CSS3. I have GIS knowledge but this technical part is new to me. I have published WMS layers to my ArcGIS server and can ...
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0answers
29 views

Multibuffer in arcpy is too slow?

I have to make multibuffer to a several shp's (30 or +) and with this code the it takes 30 minutes or more. import arcpy,time,glob,os def multibuffer (probe,Zona_trab,nombarch3,recortes2): ...
2
votes
1answer
201 views

Python Script tools for ArcGIS 10.2 is very slow (get raster properties)

I am using python script tools for ArcGIS 10.2, under Windows 8.1 64bit. When I am using the arcpy.GetRasterProperties_management() command, it's very slow to process the data. For example. I tried ...
0
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1answer
254 views

Chrome/Firefox Performance Issues

Just curious if anyone else is having performance issues with Chrome and Firefox while using an arcgis javascript web application. I have been developing an application that works great in Internet ...
5
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2answers
266 views

PostGIS ST_Union Performance

I'm trying to execute a 'dissolve' operation in PostGIS using the ST_Union command. The input layer is admittedly quite large and complex. By 'large' I mean 57,771 features, with number of vertices ...
0
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1answer
68 views

Connecting to ArcSDE with arcpy is slow (ArcSDESQLExecute)

I'm creating an API which will allow queries to be performed on my GeoDatabase. I'm using ArcSDESQLExecute to connect to ArcSDE (backed with an Oracle database). Creating the connection object is very ...
3
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0answers
153 views

Why is QGIS so much faster on Windows than Mac? (or: Why is QGis so slow on macs?) [closed]

I just went from temporarily using a Windows 7 machine with 4GB of RAM and no video card as far as I know. I'm now using a mac with 16GB of ram, etc. Its a much more powerful machine. However, QGis's ...
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0answers
65 views

Fastest method to join a lot of tables

i have a lot of feature class (see figure 1) the objective is to create one feature class that combines the attribute table (especially one field) of each feature class the attribute table of each ...
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0answers
47 views

How can I prevent ogr2ogr from trying to get the SRID from PostGIS?

I'm running ogr2ogr for a PostGIS to GeoJSON export like this: ogr2ogr -s_srs EPSG:4326 -f GeoJSON unique_geoms.json "PG:host=localhost dbname=local_data user=local_user password=local_pass" -sql ...
2
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3answers
240 views

Executing Python code takes a lot of time (more than 2 hours)? (Arcgis10.1)

I am executing this Python code, in which I am trying to determinate the position of neighbor parcel (north, south, east, west). It works fine but it took 2 hours for just 50 parcels! I think that ...
2
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1answer
148 views

GeoServer rendering performance significantly affected by vector icon size

I'm having the craziest GeoServer experience right now and I was hoping to get some input on what might be causing this behaviour. I'm using Apache Bench to benchmark rendering performance for a ...