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William Dollins geobabbler

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geobabbler / ImageType.cs
Created February 24, 2014 19:53
Determine image type from byte array in C# (http://stackoverflow.com/questions/5209506/how-can-i-know-what-image-format-i-get-from-a-stream)
View ImageType.cs
if (ImageFormat.Jpeg.Equals(image.RawFormat))
{
// JPEG
}
else if (ImageFormat.Png.Equals(image.RawFormat))
{
// PNG
}
else if (ImageFormat.Gif.Equals(image.RawFormat))
{
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geobabbler / globamaptiles.py
Created April 21, 2014 13:19
Update of globalmaptiles.py from http://www.maptiler.org to include functions to generate ArcGIS tile addresses (using hex notation) and to generate world file (affine transformation) parameters for a given TMS tile.
View globamaptiles.py
#!/usr/bin/env python
###############################################################################
# $Id$
#
# Project: GDAL2Tiles, Google Summer of Code 2007 & 2008
# Global Map Tiles Classes
# Purpose: Convert a raster into TMS tiles, create KML SuperOverlay EPSG:4326,
# generate a simple HTML viewers based on Google Maps and OpenLayers
# Author: Klokan Petr Pridal, klokan at klokan dot cz
# Web: http://www.klokan.cz/projects/gdal2tiles/
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geobabbler / worlddfile.py
Last active August 29, 2015 14:00
Function to generate world file parameters for any TMS tile. Useful for building virtual rasters. Add to globalmaptiles.py
View worlddfile.py
def WorldFileParameters(self, tx, ty, zoom):
"Returns world file (affine transofrmation) parameters of the given tile."
bounds = self.TileBounds( tx, ty, zoom)
moriginx = bounds[3] + (self.Resolution(zoom) / 2)
moriginy = bounds[0] - (self.Resolution(zoom) / 2)
return (self.Resolution(zoom), 0.0, 0.0, self.Resolution(zoom) * -1, moriginy, moriginx)
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geobabbler / server.js
Created November 22, 2014 13:22
Code snippet #1 for http://blog.geomusings.com/2013/12/11/building-a-simple-geodata-service-with-node-and-amazon-rds/
View server.js
var express = require('express'),
geo = require('./routes/geo');
var app = express();
app.get('/countries/:id/bbox', geo.bbox);
app.get('/countries/:id/bbox/:srid', geo.bboxSrid);
app.get('/countries/:id/polygon', geo.polygon);
app.get('/countries/:id/polygon/:srid', geo.polygonSrid);
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geobabbler / geo.js
Created November 22, 2014 13:23
Code snippet #2 for http://blog.geomusings.com/2013/12/11/building-a-simple-geodata-service-with-node-and-amazon-rds/
View geo.js
var pg = require('pg');
var conString = "postgres://username:password@hostname.rds.amazonaws.com:5432/database"; //TODO: point to RDS instance
exports.bbox = function(req, res) {
var client = new pg.Client(conString);
client.connect();
var crsobj = {"type": "name","properties": {"name": "urn:ogc:def:crs:EPSG:6.3:4326"}};
var idformat = "'" + req.params.id + "'";
idformat = idformat.toUpperCase();
var query = client.query("select st_asgeojson(st_envelope(shape)) as geojson from ne_countries where iso_a3 = " + idformat + ";");
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geobabbler / irl_bbox.json
Created November 22, 2014 13:24
Code snippet #3 for http://blog.geomusings.com/2013/12/11/building-a-simple-geodata-service-with-node-and-amazon-rds/
View irl_bbox.json
{
"type": "feature",
"crs": {
"type": "name",
"properties": {
"name": "urn:ogc:def:crs:EPSG:6.3:4326"
}
},
"geometry": {
"type": "Polygon",
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geobabbler / snippet6.bat
Created November 23, 2014 14:33
Code snippet 6 for blog post
View snippet6.bat
curl -X POST -d "{ \"type\": \"Point\", \"coordinates\": [-98.35, 39.7] }" -H "Content-Type: application/json" http://localhost:3000/vector/public/states_gen/features/intersect
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geobabbler / snippet7.js
Created November 23, 2014 14:34
Code snippet 7 for blog post http://blog.geomusings.com/2014/02/18/a-little-deeper-with-node-and-postgis/
View snippet7.js
/**
* retrieve all features that intersect the input GeoJSON geometry
*/
app.post('/vector/:schema/:table/:geom/intersect', function (req, res, next) {
//console.log(JSON.stringify(req.body));
var queryshape = JSON.stringify(req.body);
//continue with the rest of app.post
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geobabbler / snippet1.bat
Created November 23, 2014 15:25
Code snippet 1 for blog post http://blog.geomusings.com/2014/05/20/personal-geospatial-workflows/
View snippet1.bat
python tile_grab.py -b -158;21;-157;22 -d E:\tiles\oahu_img\a -i false -z 6 -u http://www.someserver.net/arcgis/rest/services/ImagerySvc/MapServer/tile/{z}/{y}/{x}.png
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geobabbler / snippet2.bat
Created November 23, 2014 15:26
Code snippet 2 for blog post http://blog.geomusings.com/2014/05/20/personal-geospatial-workflows/
View snippet2.bat
gdalbuildvrt 6.vrt 6/*.png