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/***********************************************************************
* Copyright © 2024-2025 Guilhem Moulin <info@guilhem.se>
* Map base setup
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
**********************************************************************/
import Map from 'ol/Map.js';
import View from 'ol/View.js';
import TileLayer from 'ol/layer/Tile.js';
import WMTS from 'ol/source/WMTS.js';
import WMTSTileGrid from 'ol/tilegrid/WMTS.js';
import proj4 from 'proj4';
import { get as getProjection } from 'ol/proj.js';
import { register as registerProjection } from 'ol/proj/proj4.js';
proj4.defs('EPSG:3006', '+proj=utm +zone=33 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs');
registerProjection(proj4);
export const projection = getProjection('EPSG:3006');
/* Lantmäteriet uses a tile-scheme where the origin (upper-left corner) is at
* N8500000 E-1200000 (SWEREF99 TM), where each tile is 256×256 pixels, and where
* the resolution at level 0 is 4096m per pixel (each side is 1048.576km long).
*
* https://www.lantmateriet.se/globalassets/geodata/geodatatjanster/tb_twk_visning_cache_v1.1.0.pdf
* https://www.lantmateriet.se/globalassets/geodata/geodatatjanster/tb_twk_visning-oversiktlig_v1.0.3.pdf
*
* We set the extent to a 4×4 tiles square at level 2 (1024px = 1048.576km per
* side) somehow centered on Norrbotten and Västerbotten, and zoom in from there.
* This represent a TILEROW (x) offset of 5, and a TILECOL (y) offset of 2.
*/
export const extent = [110720, 6927136, 1159296, 7975712];
/* XXX using the topowebbcache WMTS is fine for testing (as it doesn't require
* authentication) but not in production in a public instance as doing so would
* violate its current terms of use (as of January 2024 it's not CC0 open data).
* See
*
* https://www.lantmateriet.se/sv/om-lantmateriet/Rattsinformation/upphovsratt-och-publicering-av-lantmateriets-geografiska-information/
* https://www.lantmateriet.se/sv/kartor/vara-karttjanster/min-karta/#anchor-2
* https://help.locusmap.eu/topic/support-for-swedish-lantmateriets-min-karta-wms
*
* More precise background maps might be available in the future as open data,
* though:
*
* https://www.lantmateriet.se/sv/om-lantmateriet/press/nyheter/lantmateriets-arbete-mot-oppna-data-i-full-gang/
* https://ext-geodatakatalog.lansstyrelsen.se/GeodataKatalogen/srv/swe/catalog.search#/map uses
* https://api.lantmateriet.se/open/topowebb-ccby/v1/wmts/token/3c3a9cf47e7cb5ea24542d40d19698/?layer=topowebb&style=default&tilematrixset=3006&Service=WMTS&Request=GetTile&Version=1.0.0&Format=image/png&TileMatrix=7&TileCol=237&TileRow=155
*/
export const baseMapSource = new WMTS({
url: undefined,
version: '1.0.0',
style: 'default',
matrixSet: '3006',
format: 'image/png',
tileGrid: new WMTSTileGrid({
extent: extent,
// https://www.lantmateriet.se/globalassets/geodata/geodatatjanster/tb_twk_visning-oversiktlig_v1.0.3.pdf
tileSize: 256,
origin: [-1200000, 8500000],
resolutions: [4096, 2048, 1024, 512, 256, 128, 64, 32, 16, 8],
matrixIds: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
}),
projection: projection,
wrapX: false,
crossOrigin: 'anonymous',
});
const view = new View({
projection: projection,
extent: extent,
showFullExtent: true,
/* center of the bbox of the Norrbotten and Västerbotten geometries */
center: [694767.48, 7338176.57],
zoom: 1,
enableRotation: false,
resolutions: [1024, 512, 256, 128, 64, 32, 16, 8],
constrainResolution: false,
});
export const map = new Map({
controls: [],
view: view,
layers: [
new TileLayer({
source: baseMapSource
}),
],
});
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