Beyond Pin Mapping
From MashupCamp
The follwing notes were transcribed, poorly, by Ari Ofsevit[[1]], who also took the screen captures:
Notes
Need:
Get Map
Layers (layer names online)
Spatial Reference System (SRS): EPSG (converts between "datums")
Bounding Box (bbox)
Web Mapping Service (WMS) on wikipedia
Width and height (server often crashes with large images)
format: image/png (etc) service=wms (wfs?)
Get capabilities for each layer gives extent...you can carve down from there for the bbox
Add in as image layer in Google Earth...
Error gives an xml response
Get Capabilities
Tells what kind of images are supported
The meaty stuff
Style: various naming conventions; fallback: use "default" or "[layer name]"
WFS —> Get vector data in GML (GetFeatures), can use a GIS to pull out features with specific attributes, filtered on server
toggle different layers for base layers and top vector layers
specify percent opacity
openlayers.org (java)
WMS in Google Maps API
EPSG 4326 LATLON WGS84
{layers.....: overrides, etc, to override images, and sizes
Shameless plug for Microsoft Mapcruncher (Google it) (if you have an image but you don't have the data) and you can geocode it..
All one way, through the server, no digitizaton
Community mapping limited by the ability of citizens to put in a comment based on geometry...versus just on a pinpoint....only Microsoft (so far) has a virtual sketch layer on virtual earth...[not in a standard format]
mashup@mit.edu
