Tag: FOSS

Analysis, Cartography, Database, PostGIS, PostgreSQL, SQL, Trail Curation, Trails

Going deeper into web cartography: future=past? (and Swiss cartographic genius)

My favorite cartography book is Eduard Imhof’s Cartographic Relief Presentation.  A few years back I picked this book up (translated to English) from ESRI press for $75 if memory serves me.  Now it can be gotten for much cheaper. Imhof spends a lot of time on feature simplification and separation, a problem which keeps me up at night.  For example, if you have a lot … Continue reading Going deeper into web cartography: future=past? (and Swiss cartographic genius)

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GeoServer, GeoWebCache

GeoServer and efficient delivery of raster data (image pyramid layer) (update)

A perennial favorite on this blog is “GeoServer and efficient delivery of raster data (image pyramid layer)“. I am neither the last nor the first authority on this topic (check the GeoSolutions blog for authoritative work on GeoServer and raster, also look to the GeoServer documentation), but I’ve had some good experiences with serving rasters in GeoServer, especially using image pyramid layers Read the original, … Continue reading GeoServer and efficient delivery of raster data (image pyramid layer) (update)

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Analysis, Cartography, Database, PostGIS, PostgreSQL, SQL

Cartography and USGS — Fake Building Footprints in PostGIS now with distance operator

In a previous post (I feel like I say that a lot), I wrote about rotating address points to match nearby roads in replicate the effect of USGS quads that represented small buildings with little squares that followed the nearby road alignment. The function was effective: but deadly slow when applied to all 500,000 address points. And so we iterate. First, I’ll show you our … Continue reading Cartography and USGS — Fake Building Footprints in PostGIS now with distance operator

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GeoServer

Advanced Cartography in #GeoServer– #SLDs can make for very pretty maps

I said it in the title, I’ll say it again, SLDs are not just for ugly maps. I’ve heard from several professionals in this geospatial sector that CartoCSS is so cool– “look at the great cartography you can get out of it”. And, truth be told, creating a standard for cartography that aligns so well with existing web development standards is a brilliant way to … Continue reading Advanced Cartography in #GeoServer– #SLDs can make for very pretty maps

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Database, PostGIS, PostgreSQL, SQL

PostGIS for Dessert: Sketching shapes in #PostGIS– compass roses revisited

For one of our applications, we need 8-point compass roses placed at each of our points, as well as a circle 40 meters in diameter as well as one 140 meters in diameter.  We did a bit of work with this a while back in GeoServer using SLDs.  Now we’d like to refine it, and implementing this in an SLD is beyond my skills. So, … Continue reading PostGIS for Dessert: Sketching shapes in #PostGIS– compass roses revisited

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GeoExt, GeoServer, Javascript, OpenLayers

OpenLayers, GeoExt, GeoServer, and GetFeatureInfo

I wrote an earlier post on using GetFeatureInfo through OpenLayers to bring back a formatted html document with pictures, and formated tables, etc.  It wasn’t sophisticated, but got the job done.  Since around that time, as I’ve been building out our services, the speed with which a GetFeatureInfo request returns has g o t t  e  n  p    r     o     g       r       e        s         s            … Continue reading OpenLayers, GeoExt, GeoServer, and GetFeatureInfo

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Database, GeoExt, GeoExt, GeoServer, MapFish, PostGIS, PostgreSQL, SQL

Building simple clients for MapFish — cURL as a client

I have two previous posts on using MapFish (in this case, the GeoServer version) to allow for printing to hi-resolution PDF maps from the browser.  Here we use a command-line browser (cURL) to post our json to the MapFish service in order to retrieve our PDF. I did not keep any notes from before on making json posts to the MapFish server as a means … Continue reading Building simple clients for MapFish — cURL as a client

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Database, Ecology, Landscape Position, PostGIS, PostgreSQL

Kicking the tires of PostGIS 2.0 — Testing ST_MakeValid

The feature in PostGIS 2.0 that excited me most was not topology support, raster support, or 3D functions.  Ok, raster was near the top of my list.  But what I was really excited by was the ST_MakeValid function.  Sad, isn’t it?  Lack of vision probably– excited to try to solve recurring technical snafus in a computationally inexpensive way, rather than being more excited by the … Continue reading Kicking the tires of PostGIS 2.0 — Testing ST_MakeValid

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Analysis, Cartography, Database, PostGIS, PostgreSQL, SQL

Cartography and USGS — Fake Building Footprints in PostGIS now with distance operator

Quick and fun post tonight.  Remember in USGS quads all the little building footprints that represented civilization?  We (me and my colleague John Stein) were contemplating how to pull off something similar with address points.  Here was our first attempt: It looks ok, but may be a little crude to be considered cartography (click on it to see it bigger– you’ll see those buildings don’t … Continue reading Cartography and USGS — Fake Building Footprints in PostGIS now with distance operator

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Database, GeoExt, GeoExt, GeoServer, MapFish, PostGIS, PostgreSQL, SQL

Building simple clients for MapFish — Beginnings of a PL/pgSQL function

I’ve had a couple of other posts (1 and 2 and 3 and) on simple clients for MapFish.  I like the client server infrastructure for MapFish– with the client end of things built up in GeoExt, it makes for a really elegant combo.  But I’d like articulate my vision for simple clients for MapFish a little further.  One thing that seems quite feasible is to … Continue reading Building simple clients for MapFish — Beginnings of a PL/pgSQL function

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