Performance concerns how effectively a computing system uses resources.

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0answers
48 views

How to use more cpu while processing in qgis

I'm trying to do some clip process with a quile large layers but the process is too slow. When I see the task administrator, just around 28% of the cpu is being used. I've tried with 32-bit and ...
-2
votes
1answer
32 views

How much RAM do I need per SDE DB [closed]

Estimating RAM required is never a fixed number. However, there are base figures to follow for example for arcgis server services. How much RAM do I need to plan per DB? I'm using SQL Server but ...
1
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0answers
24 views

Why C# Server Object Extensions are faster [closed]

From my experience C# SOE are the fastest. It is also discussed here. ArcGIS Server is developed in Java, how come .NET is the fastest?
2
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0answers
40 views

How do I speed up testing debugging when I am loading a large module as part of my program? [closed]

I'm using PyScripter to do some python geocoding automation and I'm coming across the situation where I am waiting several tens of seconds for a large module to be imported. This is very inconvenient ...
0
votes
1answer
56 views

Improving processing time of ArcPy script?

Background: I work for an electrical utility, and we have a point feature class called "meters" that contains approximately 35,000 records. These records represent the actual power meter, and contain ...
0
votes
0answers
13 views

QGIS 2.12 speed up redraw is not working (PostGIS vector layers)

I have about 20 layers. Most of them are PostGIS layers (no raster). All layers in the canvas of my Project are redrawn after every update (for example by paining the map window or switching the edit ...
4
votes
2answers
54 views

performance problem with PyQGIS: manipulating attributes

I have selected a vector layer with attributes slope and area. I want to combine all the features with slope 0 to 5, 5 to 10, ... , 85 to 90. The original features are to be discarded, and new ...
6
votes
1answer
48 views

Fast Select by location in FME?

I've got a large polygon feature class that covers the whole of GB and contains about 120k features. I need to do a spatial filter on this feature class in FME workbench. I've done this in Arc ...
1
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1answer
37 views

Can I make my zonal analysis faster?

I created this python script which performs zonal analysis for the 100m, 200m, 300m, and 400m surrounding a list of points. It works but I have two main problems: A) The raster I am processing has ...
1
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0answers
15 views

Subset of spatial data causes slow SQL Spatial STIntersects

I've been having an issue were a specific subset of data causes an SQL spatial intersect to run extremely slowly. I am running sets of 1000 points against a subset of polygon layer to be intersected. ...
2
votes
0answers
51 views

Benchmarking ArcPy / ArcMap Performance on different computers?

This project came out of my need to build a justification for a faster work computer. Before asking for new equipment I want to be prepared to show the increase in performance by adding RAM or more ...
11
votes
3answers
413 views

How many layers are too many layers in ArcMap?

I work on ArcGIS using a Citrix virtual software connection at work. It is dreadfully slow at times, and without any changes to the MXDs I'm working on, one minute ArcMap can be operating at a ...
3
votes
1answer
58 views

Postgis spatial index not used

I have the following table : Table "osm_france.france_2po_4pgr" Column | Type | Modifiers ---------------+---------------------------+----------- id | ...
1
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0answers
23 views

Geoserver VM with NAS, Should I store entire VHD on the NAS or just map the data directory? Or just go with internal SSDs w/ weekly backups?

Our humble geoserver instance needs to be able to host GEOTIFF image pyramids ranging in size from a few gigs to a few TBs. A NAS appliance with raid 10 seems smart from a maintenance/expandability ...
3
votes
1answer
98 views

Speeding up extraction time of proportion of land cover types in buffer from raster using R?

I would like to extract land cover data in a buffer of 10 km around objects of class SpatialLines and calculate proportion of each land cover type. So, I used the function extract (package raster). I ...
3
votes
2answers
73 views

Dissolving with PostGIS slow and results in large table?

I am having a table of polygons with some 15 Mio. records. The polygons hold an attribute called "dn" with integer values between 0 and 6. My goal is to simplify that table so that polygons below a ...
2
votes
1answer
40 views

Improving performance when importing file geodatabase into PostgreSQL?

I have a file geodatabase created with ArcMap 10.1 that contains one feature class with 650 million points. The feature class contains the shape field and an identifier. The .gdb is approximately ...
0
votes
2answers
48 views

Will .sbn and .sbx files (spatial index) speed up operations in GDAL/OGR?

I'm trying to intersect large datasets in OGR and python using SQL queries like ST_Intersects and ST_Contains. These operations run very fast in ArcMap but I'm designing a system to automate them, ...
2
votes
1answer
60 views

Improve performance of a PostGIS st_dwithin query

I am doing a local statistic, similar to the the one described in an earlier question / answer: SELECT a.tree_id, a.species, avg(b.age) as age_avg, count(*) as samples, a.geom FROM trees a LEFT JOIN ...
1
vote
1answer
50 views

Dissolve in ogr / python

I have a set of ~100,000 polygons (.shp format). Using python and ogr I would like to dissolve them to one feature class to speed up other downstream operations. The command I am using is: ogr2ogr -f ...
1
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2answers
86 views

Speeding up Python code to convert multiple csv to shapefile?

I am trying to work with some crime data from https://data.police.uk/data/ The data is organised in several .csv files, one for each month and each crime is geocoded with Lat and Long. As the file ...
0
votes
0answers
23 views

Analysing TMS / WMS usage and performance

to tune my webservices, I like to know, if there are existing anlysis tools to measure spatial requests (similar like Piwik does for web requests). There is Maptiks as service, but I'm looking for an ...
0
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1answer
51 views

Improving performance of Clip using OGR?

I have a set of points which I am trying to clip to a set of polygons. The files have many features (150,000 polys, 8,000 points). I'd like to automate this process carry it out once a day, hence I am ...
2
votes
0answers
96 views

How to speed up my script? [closed]

I am looking for the way to speed up my script. It is working fine, I mean, the final output is as required, but it is clunky and really slow. It is slow because of the double 'for..in..' loops, I ...
1
vote
1answer
230 views

Increase python script speed [closed]

for row1 in cursor1: if row1[0] != None: num3=row1[0].upper() custx=row1[4] custy=row1[5] num2=row1[8] try: ...
1
vote
1answer
48 views

Load testing WMS capabilities for GeoServer instance?

I would like to load test the WMS capabilities for our GeoServer instance. How should I go about this? Server is running 64 bit ubuntu 14.04, Oracle Java 8, and geoserver 2.7.2 I know I could ...
1
vote
2answers
63 views

Improves performance on R working with raster files

I´m trying this code to look for NA and negative pixel values and replace it for 0. But it´s too slow. Any tip for improve the performance of it? "all.files" is a list of address of the images. "r1" ...
1
vote
1answer
22 views

Does size of data fields included in attribute table of feature class affect performance if feature class is published?

Does the size of data fields included in the attribute table of a feature class affect the performance if the feature class is published? I am wondering if the number of the fields included in the ...
2
votes
0answers
25 views

Performance of 'extract by mask' tool in PostGIS?

Context: A large raster is clipped to create a bunch of smaller rasters based on a bunch of shapefiles. I've used st_clip() which seems to take forever looping through the different shapefiles, so ...
9
votes
4answers
836 views

Does a large amount of GPU memory help when working with very large images and image mosaics?

It seems like it would help a great deal to store as much of the image as possible on the GPU for panning and zooming, etc. We deal with a lot of very large images. Many range from 8 GB to hundreds ...
0
votes
0answers
4 views

Heartbeat of GeoWebCache or underlying WMS [duplicate]

I've set up a geowebcache for some app developers to use. They discovered that if the mapserver behind the geowebcache (gwc) is not running then they're not getting the tiles even if the ...
8
votes
3answers
374 views

Fastest way to convert big raster to polyline using R or Python?

I have a big raster file (129600 by 64800 pixel) with global water bodies (1 bit values 0 and 1) and try to extract ocean and inland water shorelines. I've tried with ArcGIS and QGIS to convert from ...
1
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1answer
38 views

Workaround to not create new layer

I have a working code (shown at the bottom). The problem is process time is about 12 seconds for each loop. If I want to use this for the whole data I have (about 1 million points), it would take ...
0
votes
0answers
172 views

How to improve performance when using a large amount of data (big tables) in ArcGIS?

I'm working with the kinematic wave method to determine the runoff of a basin, I am using the explicit method for resolution (The Lax-Wendroff scheme): I'm working with script code in python (i'm ...
4
votes
2answers
78 views
+50

Identify and delete overlaping or near lines with similar running

I have shapefiles with lines that shows surface water runoff. I need to clear and simplify these shapefiles by condition that if some lines are near by other and has similar running, this lines has to ...
2
votes
2answers
82 views

MapInfo and large GIS data

I have a very large map file (.TIF) and a large DTM file (.GRD). When I add them to my layers in MapInfo I get a .TAB file. When my Map / DTM are visible MapInfo works and responds really slow and ...
2
votes
1answer
62 views

Best practise for managing shapefiles in QGIS

One aspect of GIS that wasn't covered in my training was the best way to manage shapefiles within a project. In my hypothetical example I have a shapefile with a number of attributes. I want to ...
0
votes
1answer
92 views

How worked with large shapefile using sharpmap? [closed]

I use sharpmap for working with shapefile. Now shape file is big and sharpmap take a long time to loading layers. Please tell me how i can speed up working with shapefile.
1
vote
1answer
71 views

QGIS suddenly very slow generating atlas on PC?

I have been using happily QGIS for about 6 months, in the last week it has suddenly got much slower when generating an atlas using print composer. I am running QGIS 2.10.1 on a PC laptop (Windows 7, ...
2
votes
0answers
67 views

Improving performance of Laspy? [closed]

I have a working code for a project, but right now to run through the data it would take years to be completed. Please help me to improve it: import laspy import laspy.file import numpy as np ...
1
vote
0answers
23 views

Combining ArcGIS API for JavaScript external files for faster performance?

I have a jQuery mobile application which runs 'ok' but I am looking at trying to speed up performance. I ran the 'Audit' tool against it in Chrome's Developer Tools and one of the recommendations is ...
1
vote
0answers
69 views

Performance Scanning Big Rasters in GeoTIFF Format? [closed]

I am scanning large rasters in GeoTIFF format. The size is around 30GB and there is only one band. I'm using geotools to do that. I did some experiments on scanning the whole raster to find the best ...
8
votes
9answers
3k views

Maximizing the use of CPU

My script is intersecting lines with polygons. It's a long process since there are more than 3000 lines and more than 500000 polygons. I executed from PyScripter: # Import import arcpy import time # ...
2
votes
1answer
64 views

Image cache on network drive vs. SDE/Oracle

We currently have all of our image data loaded into ArcGIS SDE/Oracle 9.3. There is a proposal to not load our 2015 orthoimagery into SDE/Oracle in order to save time and place it in a tile cache or ...
1
vote
0answers
95 views

Geoserver MBTiles plugins performance issues

I am using the latest stable 2.7.2 version of GeoServer and I am trying to play with the MBTiles plugin, I have installed also WPS plugin that is needed by the MBTiles one (otherwise I got error when ...
2
votes
0answers
48 views

Making Large Data Sets Faster in ArcGIS Online or Portal

I have a sql view joined to a parcel layer for the entire city of New York (over 800k records). All data is registered to to the arcgis server. As you could imagine, this produces very slow response ...
3
votes
0answers
92 views

ITopologicalOperator2 operation Simplify taking very long in ArcGIS 10.3.1

I have a method that does a simplification of geometries. I have used this common code since ArGIS 9.2 without issues and it still works fine in ArGIS 10.2.2. Recently I upgraded a project to 10.3.1 ...
3
votes
1answer
117 views

Why does arcpy.ListFeatureClasses() take so incredibly long?

I'm having an issue where calling arcpy.ListFeatureClasses() in a workspace with 400 shapefiles takes a very long time (more than 10 minutes). Using the os module to achieve the same effect takes ...
0
votes
0answers
22 views

Level of detail options for drawing features in Open Layers 3?

I am drawing various level sized features in Open Layers 3. When drawing State boundaries, performance barely drops perceptively, but, it drops horrendously when drawing county layers. Is there a ...
0
votes
0answers
38 views

ArcMap labeling performance using Citrix or RDS?

We have virtualized ArcMap in both Citrix and Remote Desktop Services environments. In both Citrix and RDS, when viewing a MXD that has a good amount of labels, the rendering is very slow. On a ...