Góp nhặt của một kẻ mù công nghệ :p
Công nghệ GIS
GIS là gì? Sự ra đời của ngành GIS
Hệ thống thông tin địa lý GIS (viết tắt của cụm từ tiếng Anh Geographic Information Systems) là một công cụ tập hợp những quy trình dựa trên máy tính để lập bản đồ, lưu trữ và thao tác dữ liệu địa lý, phân tích các sự vật hiện tượng thực trên trái đất, dự đoán tác động và hoạch định chiến lược. Thuật ngữ này được biết đến từ những năm 60 của thế kỉ 20 và Giáo sư Roger Tomlinson được cả thế giới công nhận là cha đẻ của GIS
QGIS Open Day (25-11-2022) https://github.com/qgis/QGIS/wiki/QOD-November-2022 Welcome to the November 2022 QOD sessions on QGIS and how to contribute to the documentation and how to compile QGIS. Simply watch the Youtube Livestream and comment on the day, or catch the recording […]
[JS GIS] JavaScript GIS Simplify | GeoToolbox Credit: Simplify by neocarto https://observablehq.com/@neocartocnrs/simplify?collection=@neocartocnrs/geotoolbox
[JS GIS] JavaScript GIS Dissolve | GeoToolbox Credit: Dissolve by neocarto https://observablehq.com/@neocartocnrs/dissolve?collection=@neocartocnrs/geotoolbox
[JS GIS] JavaScript GIS Tissot | GeoToolbox Credit: Tissot by neocarto https://observablehq.com/@neocartocnrs/tissot?collection=@neocartocnrs/geotoolbox
[JS GIS] JavaScript GIS Geolines | GeoToolbox Credit: Geolines by neocarto https://observablehq.com/@neocartocnrs/geolines?collection=@neocartocnrs/geotoolbox
[JS GIS] JavaScript GIS Featurecollection | GeoToolbox Credit: Featurecollection by neocarto https://observablehq.com/@neocartocnrs/featurecollection?collection=@neocartocnrs/geotoolbox
QGIS merge points within distance Issue How One possible approach consists in the following steps: draw a buffer of 5m around points; dissolve the buffers which overlap; calculate the centroids of dissolved buffers. You can choose the tools with which you’re more comfortable. Example\ For […]
[JS GIS] Gridded Population (15 minute) – United States in JavaScript Credit: Gridded Population (15 minute) – United States by Evan Galloway https://observablehq.com/@gallowayevan/gridded-population-15-minute-united-states
[JS GIS] JavaScript GIS Coords2geo | GeoToolbox Credit: Coords2geo by neocarto https://observablehq.com/@neocartocnrs/coords2geo
GDAL GIS in Browser (JS GIS | geotoolbox) ] geotoolbox is javascript tool for geographers. It allows to simply deal with geojson properties (attribute data) and provides several GIS operations useful for thematic cartography. 1. Installation 1.1. In browser Latest version <script […]
Summary https://www.lutraconsulting.co.uk/crowdfunding/pointcloud-processing-qgis/ In the wake of successful crowdfunding campaigns in 2020 and 2021, we are pleased to announce the launch of a new campaign to further improve QGIS capabilities in managing and analyzing point clouds. The objectives of this campaign are to: Add […]
Leaflet vector tiles example Vector tiles Plugins to display vector tiles. Plugin Description Demo Maintainer geojson-vt Efficient library for slicing GeoJSON data into vector tiles on the fly. Mapbox Hoverboard Render vector tiles on canvas with leaflet (geojson, topojson, and protobuf). […]
SELECTION in WMS servering by QGIS Server Full query https://geoviet_mapserv.dothanhlong.org/?MAP=/gis/mbgis/api.qgs&service=WMS&request=GetMap&layers=vn_vunghanhchinh&styles=&format=image%2Fpng&transparent=true&version=1.1.1&tiled=true&width=256&height=256&srs=EPSG%3A3857&bbox=11897270.578531114,1252344.2714243277,12523442.714243278,1878516.4071364922 SELECT a Feature You only can use id attribute to select feature Selected feature is highlight in yellow https://geoviet_mapserv.dothanhlong.org/?MAP=/gis/mbgis/api.qgs&service=WMS&request=GetMap&layers=vn_vunghanhchinh&styles=&format=image/png&transparent=true&version=1.1.1&tiled=true&width=256&height=256&srs=EPSG:3857&bbox=11897270.578531114,1252344.2714243277,12523442.714243278,1878516.4071364922&selection=vn_vunghanhchinh:41 Refernces https://docs.qgis.org/3.22/en/docs/server_manual/services/wms.html
Filter in WMS servering by QGIS Server Full query https://geoviet_mapserv.dothanhlong.org/?MAP=/gis/mbgis/api.qgs&service=WMS&request=GetMap&layers=vn_vunghanhchinh&styles=&format=image%2Fpng&transparent=true&version=1.1.1&tiled=true&width=256&height=256&srs=EPSG%3A3857&bbox=11897270.578531114,1252344.2714243277,12523442.714243278,1878516.4071364922 Filter query https://geoviet_mapserv.dothanhlong.org/?MAP=/gis/mbgis/api.qgs&service=WMS&request=GetMap&layers=vn_vunghanhchinh&styles=&format=image/png&transparent=true&version=1.1.1&tiled=true&width=256&height=256&srs=EPSG:3857&bbox=11897270.578531114,1252344.2714243277,12523442.714243278,1878516.4071364922&filter=vn_vunghanhchinh: "ten_vi" = 'Phú Yên' Refernces https://docs.qgis.org/3.22/en/docs/server_manual/services/wms.html
Python make Choropleth map with mapclassify https://pysal.org/mapclassify/