1,808 reputation
610
bio website ariasprado.name
location Spain
age 39
visits member for 3 years, 7 months
seen Feb 1 at 17:45

A not so young guy in northwest Spain working with MapServer, GeoServer, OpenLayers, GDAL, PostGIS, TileCache and related GIS stuff.


Jul
8
comment MapGuide or Mapserver for Enterprise?
I agree with whuber's considerations. I would add that another important factor is the GIS related expertise, or know-how, already present in the organization. Let us say that there are workers with experience with MapServer, but little or none with MapGuide (or MapGuide). This would give, in my opinion, MapServer (or MapGuide) a significative advantage.
Jul
8
comment Fastest spatial storage format?
Where is the bottleneck seems an interesting and open question that depends on a number of variables, perhaps the kind of workload is one important. I remember that once I indexed some shapefiles with shapetree for getting a faster rendering of some vector layers with MapServer, and I did not get a significative performance gain.
Jul
8
comment Fastest spatial storage format?
Your question seems to imply that the bottleneck is the process of reading data. My experience is that actual load is in the rendering process itself, at least with MapServer. That is, I do not see that using shapefiles or an spatial database will make a great difference.
Jul
2
comment Determine Projection
After some research, I have also the same impression.
Jun
22
comment Change the size of an OpenLayers.Control.OverviewMap
Personally I find simpler, and prefer, something like var ovMapControl = map.getControlsByClass('OpenLayers.Control.OverviewMap')[0];
Jun
2
comment Geoserver/java out of heap space - how do I increase it?
Well, to my understanding the options you mentioned are valid for Oracle's JVM, that is, not standard, and even not stable. "Options that begin with -X are non-standard (not guaranteed to be supported on all VM implementations), and are subject to change without notice in subsequent releases of the JDK. Options that are specified with -XX are not stable and are not recommended for casual use. These options are subject to change without notice." (oracle.com/technetwork/java/javase/tech/…). The question has problem: Elliveny is not telling us what JVM is using.
Jun
1
comment Mapserver: labels and tiles
+1 I didn't know about this feature of MapServer. Thus, when caching, with TileCache, WMS layers I avoided annotation layers because the effect described in the question. Please, could you tell us since what MapServer version is this feature available?
Apr
13
comment Technical comparison of Oracle and PostgreSQL
Non technical comment: PostGIS is already being used for serious work. For instance, the Institut Géographique National of France decided to use PostGIS after benchmarking it and propietary solutions like Oracle or DB2. More information about it can be found at postgis.refractions.net/documentation/casestudies/ign.
Mar
15
comment Why don't they use cell towers like GPS satellites?
As said before, the number of cell towers in rural areas is low, because cell operators find that this kind areas are not profitable. In addition, there would be another problem: in flat terrains, one these cell towers can cover an area as large as a 35 kilometers radio circle by just using one omnidirectional antenna (GSM, 850-900 MHz). I guess that in such scenario there would not be a lot of room for accurate geo-location.
Nov
16
comment Should GDAL be set to produce GeoTIFF files with compression? Which algorithm should be used?
I am not claiming that a loosy compression format is always a valid storage format. What I wanted to mean is that using a format like ECW is suitable in some production environments. For instance, ECW is a more suitable format than GeoTIFF if we have a MapServer instance serving ortophoto layers via WMS. Nothing forbids that you also store the ortophoto using lossless compression.
Nov
8
comment DBF creation and manipulation without excel 2003
I disagree with the users Zachary and Darren Cope. OpenOffice (OO) can be used to edit DBF files, and I have done it. However, my experiences with OO + DBF files - which were part of ESRI shapefiles - have always been awful: for me it never worked.
Oct
14
comment what are the main advantages of using a Double Stereo projection?
Thank you for the link to the Map Projections Summary. +100, if it were possible.
Oct
11
comment How can I work with 3+ Gigabyte TIFF Files?
I agree when you say that GIS software should be used if possible. Anyway, I think that there may be another issue. If mcd's computer is 32-bit, given the theoretical 4GB RAM memory limit these kind computers have and the fact that OS and other applications also consume memory, processing a 3.2GB image can be beyond machine's capabilities (I do know that virtual memory is there, but in this case the system might become irresponsive). Likely GIS aware software can internally process the image by parts, so memory limit is not an issue.
Sep
29
comment What is the most annoying fact about the GIS market/industry?
Not to say that in case the language you work with uses non-ASCII 7-bit characters (Galician and Spanish in my case), rendering labels and showing results of GetFeatureInfo requests so regular users do not see 'trash chars' ('Abadín' instead of 'Abad?n') is a hell, a time sink and not always possible.
Sep
25
comment Using shp2img and Remote Objects instead of WMS
You are right, what I wanted to mean is what you said about rendering on the fly currently much slower than serving from tile caches. Sorry, English is not my native language!
Sep
22
comment How do I display geojson polygons on a map?
My experience with Google Maps is very limited and null with Open Street Map, so I cannot give you an answer. About displaying 1700 polygons at once, likely client's web browser will hang. In my opinion it is not OpenLayers fault, but current web browsers poor rendering capabilities. I have used OpenLayers + WFS + GML to draw vector layers, and with much less work the web browser hangs. The altenative is displaying these polygons as raster data using WMS (Web Map Service). The web browser will only have to show a set of pictures, no rendering work. Both MapServer and GeoServer provide WMS.
Sep
22
comment How do I display geojson polygons on a map?
My experience with Google Maps is very limited, so I cannot give you an answer. In the case of Open Street Map, null.