knutole

SELECT ST_Transform(ST_Intersection(lg.geometry, bbox.geom), 4326) As geometry, 
SELECT "name","type","area","z_order"  As properties FROM osm_landusages As lg, (
SELECT ST_Transform(ST_MakeEnvelope(-2.8125,38.82259097617711,25.312499999999986,57.326521225217064, 4326),3857) as geom) as bbox
WHERE ST_Intersects(lg.geometry, bbox.geom)
AND (area > 200000000);

knutole

Wu.DomEvent.on(box, 'keydown', this._throttledSave, this);

_throttledSave : function () {
  _.throttle(this.save, 1000); 
},

save : function () {
  var text = div.innerHTML;
  this._project.setText(text);
}

knutole

var mapnik = require('mapnik');

var proj4 = '+proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +wktext +no_defs +over';
var mercator = new mapnik.Projection(proj4);

/**
 * SphericalMercator constructor: precaches calculations
 * for fast tile lookups
 */
function SphericalMercator() {

knutole

# second problem
select row_to_json(t) from (SELECT rid, pvc FROM file_pszjkuicfjvxvizbygbq, ST_ValueCount(rast,1) AS pvc WHERE st_intersects(st_transform(st_setsrid(ST_geomfromgeojson('{"geometry":{"type":"Polygon","coordinates":[[[9.31640625,60.88770004207789],[9.31640625,61.48075950007598],[10.8984375,61.48075950007598],[10.8984375,60.88770004207789],[9.31640625,60.88770004207789]]]}}'), 4326), 3857), rast) as t;

error running query { [Error: ERROR:  unknown GeoJSON type




# first problem, solved!
select row_to_json(t) from (

knutole

WITH first AS (
   SELECT id, (ST_Intersection(rast, rast, 0)).val
   FROM file_caolvkddzzlgmvyeofrh
   INNER JOIN file_xbwnbydpmwesokzmrcht ON ST_Intersects(rast, rast, 0)
)
SELECT id, COUNT(val), SUM(val), AVG(val), stddev(val), MIN(val), MAX(val)
FROM first
GROUP BY id;

knutole

The idea here is that there are two different rasters - one large rasterA, and one small rasterB used as a mask.  We need to get the values of rasterA which are within the bounds of rasterB. 

Additional problem: rasterB has NODATA value of 0, and ONLY the part of the rasterB that is NOT NODATA should be used as a mask.

The example below is wrong, for several reasons. Can you fix it?

select row_to_json(t) from (
    SELECT A.rid, B.rid, pvc
    FROM rasterA A 
    JOIN rasterB B 

knutole

I simply need to clip a raster by a GeoJSON polygon. However, the query needs to fit into a Mapnik wrapper (of which I have no control).

# Full Mapnik query from PostGIS logs
SELECT ST_AsBinary(ST_Band(ST_Resample(ST_Clip("rast", ST_Expand(ST_SetSRID('BOX3D(743579.4111581944 8570731.10756024,900122.4450862355 8727274.141488284)'::box3d, 3857), greatest(abs(ST_ScaleX("rast")), abs(ST_ScaleY("rast"))))),305.748 * sign(ST_ScaleX("rast")),305.748 * sign(ST_ScaleY("rast")), 0, 0), 1)) AS geom FROM (SELECT ST_Clip(rast, st_transform(st_setsrid(ST_geomfromgeojson('{"type":"Polygon","coordinates":[[[9.019775390625,61.370409712010435],[7.998046875,61.17503266354878],[8.7890625,61.16443708638272],[9.29443359375,60.62471311568258],[10.469970703124998,61.63250678169624],[9.5361328125,61.201506036385375],[9.019775390625,61.370409712010435]]]}'), 4326), 3857)) FROM file_tpspmpkrwlsrcchskibg) as subquery WHERE "rast" && ST_SetSRID('BOX3D(743579.4111581944 8570731.10756024,900122.4450862355 8727274.141488284)'::box3d, 3857)

knutole

There are a bunch of reasons why this is convoluted, mostly in building the URL to make the request:

1. You have to rely on an AJAX request, this example uses jQuery
2. To make a GetFeatureInfo request, you must provide a BBOX for a image, and the pixel coordinates for the part of the image that you want info from. A couple of squirrely lines of Leaflet code can give you that.
3. Output formats. The info_format parameter in the request. We don't know a priori which will be supported by a WMS that we might make a request to. See Geoserver's docs for what formats are available from Geoserver. That won't be the same from WMS to WMS, however.
4. WMS services return XML docs when there's a mistake in the request or in processing. This sends an HTTP 200, which jQuery doesn't think is an error.

knutole

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knutole

#!/bin/bash

# Install docker community edition on Ubuntu
# Updated May 5th 2017
# Maintained by <knutole at mapic dot io>
# 
# For more info, see: https://docs.docker.com/engine/installation/linux/ubuntu/

DOCKER_COMPOSE_VERSION=1.13.0
DOCKER_MACHINE_VERSION=0.10.0