Difference between revisions of "Benchmarking 2010/How to get some sample data"

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(rendering notes)
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Remember that the baseline of the OSGeo Benchmark for raster data are GeoTIFF files, but note you can only download ECW files. We will be converting the ECWs to GeoTIFFs.
Remember that the baseline of the OSGeo Benchmark for raster data are GeoTIFF files, but note you can only download ECW files. We will be converting the ECWs to GeoTIFFs.
There will be one big file for each one of the sheets in the following diagram:
== Vector data issues ==
== Vector data issues ==

Revision as of 09:02, 9 June 2010

How to download sample data

The datasets will require some time to be merged and prepared, and the simbology still isn't fully decided on. In the meantime, you can download some sample data by following these steps:

This is the website where the Spanish National Mapping Agency publishes some datasets

  • On the top of the page, hit the Welcome link to enter the english version of the page

  • Register for a new user. You'll need to enter the desired username, password, repeat password, full name and surname, email, and solve a captcha.

  • Enter your account details to log in.

  • In the "products" drop-down menu, select either BCN25-BTN25 for vector data, or Ortofoto PNOA Máxima Actualidad for aerial imagery.

  • In the "MTN50 sheet number", enter any number between 1 and 1108.
Barcelona is 420-421; Madrid is 559. You may want to check a sheet reference (caution: sheet reference is a 17MB image)

  • Hit "See list of products". Select a file to download. You will see the license for the data, which boils down to "do not make any commercial use of this data" and "say that the data comes from the IGN"

  • You will see a survey. Hit "No enviar y continuar con descarga"

  • Hit "Click here yo begin download"

Raster data issues

Remember that the baseline of the OSGeo Benchmark for raster data are GeoTIFF files, but note you can only download ECW files. We will be converting the ECWs to GeoTIFFs.

There will be one big file for each one of the sheets in the following diagram:

File:Cataluña mtn50 sheets.jpg

Vector data issues

Once unzipped, a sheet of vector data contains lots of shapefiles. The shapefiles will be merged, and most probably only the most interesting themes will be used.

Please note that the shapefiles are in ETRS89 + UTM28N/29N/30N/31N. The final shapefiles will be in WGS84, so you're encouraged to reproject them if you think it's neccesary for your testing.

A letter after the theme code explains what kind of geometry the shapefile contains. P stands for Point; L stands for Line; S stands for Surface (Polygon).

Code Theme How should it be rendered
0101L Administrative Boundary Depends on field TIPO_101, different kinds of dashed line
0104P Administrative Milestone
0107S National park 2px dark green border with light green fill
Elevation & contour
0201L Contour lines Depends on field CATEG_201, 1px light or dark brown line
0204P Elevation measured point Label with field COTA_204
0207L/0207S Elevation discontinuity: cutting, embankment, scree
0301L River 3px blue line, label with field ETIQUETA
0304L Canal 1px blue line, with flow arrow
0307L Pipeline
0310L Wash
0312L Waterway axis
0316S Lake 2px blue line for border, light blue fill
0319S Wetlands
0325L Reservoir
0328S Pond
0331S Depot
0334P Raising
0337P Waterfall
0340P Siphon
0343P Canal Milestone
0346P Mouth
0349L Closure
0352L Coastline
0355S Island
0358S Salt Pond
0401L Firebreaker
0404P Tree
0407S Greenhouse
0501S Settlement Light grey fill, rendered under any other features
0504S Building group
0507S Building Pinkish/Purplish fill
0513S Industry Purplish fill
0516S Place of worship
0519S Mill symbol
0522S Cemetery Fill with symbol pattern
0525P Monument
0528L Wall/fence 1px black line
0531L Block
0534P Tower
0537P Cave
0540P/0540S Mine
0543P/0543L Tunnel
0546L/0546S Bridge
0549L Aquaduct
0552S Dam
0555L/0555S Historic building Pinkish fill
0558P/0558S Archaeological
0561S Park Green fill
0564S Sports Green fill
0567P/0567S Leisure
0570S Water treatment
0573S Waste treatment
0576S Depot
0601L Motorway 4px yellow line, with 1px red casing and 1px centerline
0604L Road 3px orange, green or yellow line (depends on CFUN_0604 field) with 1px black casing
0607L Motorway/road link Depends on TIPO_0607 field: 2px red, orange, green or yellow line with 1px black or red casing.
0610L Track 1px dashed brown line
0613S Parking/service area
0614P Fuel station symbol
0617P Road Milestone 3px black circle; label with field ETIQUETA
0620L Street 1px grey line
0623L Path 1px dashed black line
0626L Footway 1px dashed red line
0629L Cycleway 1px dashed blue line
0632L Route
0635L Cattleway
0638L Hi-speed rail 3px black line, with "X" on it ----X----
0641L Conventional rail 3px black line
0644L Special rail 3px black line, with vertical lines on it
0647L Aerialway
0650S Train station
0653S Rail Milestone 5px circle, label with field ETIQUETA
0656L Seaport
0659P/0659S Beacon/bouy
0662S Airport Runway Greyish-purplish
0665S Airport Apron Light pink; symbol at centroid.
0701L Fuel pipeline 1px Dashed black-and-yellow line
0704P Fuel extraction
0707S Fuel depot
0710L Power line 1px Dashed red-and-black line
0713S Power plant Dark grey fill
0716P Power tower symbol
0719S Power substation Dark grey fill
0725P Antenna
Toponyms & extra
0801P Toponym w/o geometry Label with field ETIQUETA
0802P Toponym w/ geometry Label with field ETIQUETA
0803L Mountain range toponym Label with field ETIQUETA
0901S Sheet border
1001P Geodetic survey/triangulation point Triangle with dot in center

Rendering notes

This is by no means neccesary, but you might receive a penalty* if your rendering hits any of the following common pitfalls:

  • Overlapping labels. Your software has text collision detection, hasn't it?
  • Labels on linear features (e.g. river names) should follow the line geometry. Every letter tilted at the same angle = failure.
  • Rendering any road casing on top of any road fill.


* The penalty is that Iván will not buy you a beer during FOSS4G. See, this is a friendly competition, but we can play rough :-P

Ideal rendering

In an ideal world where money grows on trees and the streets are made out of candy, the development teams should have unlimited time to work on the map rendering.

Ideally, the rendering should be the same as the official topographic maps. You can download samples from the IGN (just follow the above instructions, but select MTN25RASTER instead of BCN25/BTN25).

As you may see, the rendering rules can become very complex, and be non-intuitive at first. This is a performance benchmark, not a beauty one, so teams should focus on performance, and not pixel-to-pixel accuracy.

For reference, the legend of the topo map looks like this:

Bcn25 btn25 legend.jpg