如何获取谷歌地图中伊朗省级虚线边界的经纬度坐标以生成多边形？

Awesome question! I’ve tackled similar geospatial tasks before, so here are a few practical, actionable methods to grab those latitude/longitude coordinates and turn them into usable polygons:

Method 1: Google My Maps (Manual + Tool Combo) #

This is the easiest way for single or small batches of provinces:

• Fire up Google My Maps and create a new map project
• Search for your target Iranian province (e.g., "Isfahan Province, Iran")—you’ll see the dashed provincial border pop up. Click it to highlight the boundary
• Use the "Add path" tool and click along the highlighted dashed line to trace the full border. The tool automatically logs every point’s lat/long as you go
• Once you’re done tracing, click the path you created, select "Download KML", and save the file. Open it with a text editor or GIS tool (like QGIS) to extract the raw coordinate arrays, which are ready to use for polygon generation

Method 2: Google Maps Place Details API (Batch-Friendly) #

If you need to pull data for multiple provinces at once, the API route works—just keep an eye on Google’s usage rules and quotas:

• Use the Place Details API by passing the province’s name or unique Place ID. The response will include a geometry field if the full border data is available
• For provinces with polygon boundaries, you’ll get a nested array of lat/long pairs under geometry.polygon.coordinates (or multipolygon if the province has enclaves)
• Here’s a quick pseudocode example to illustrate the workflow:

  // Replace with your API key and target province's Place ID
  fetch('https://maps.googleapis.com/maps/api/place/details/json?place_id=YOUR_PROVINCE_PLACE_ID&fields=geometry&key=YOUR_API_KEY')
    .then(res => res.json())
    .then(data => {
      // Extract polygon coordinates (adjust for multipolygon if needed)
      const borderCoords = data.result.geometry.polygon.coordinates;
      console.log('Border coordinates:', borderCoords);
    });
  

  Heads up: Not all provinces will return full polygon data via the API—some might only give a center point. Test with your target provinces first!

Method 3: QGIS + Google Maps Basemap (High-Precision) #

If you need super accurate boundaries or want to avoid manual tracing, use a GIS tool like QGIS:

• Install QGIS and add the Google Maps vector basemap (use the QuickMapServices plugin to access it easily)
• Create a new vector layer set to "Polygon" type
• Trace over the dashed provincial border on the basemap using QGIS’s digitizing tools. The tool records every coordinate point as you draw
• Once finished, export the layer as GeoJSON or Shapefile—both formats include the full set of lat/long coordinates you need for polygon creation

Quick Notes to Keep in Mind #

• Always follow Google Maps’ service terms, especially if you’re using this data for commercial purposes
• Double-check coordinate accuracy—some border lines might have been updated recently
• KML, GeoJSON, and Shapefile outputs work with almost all polygon generation tools, so you won’t need heavy conversion work

内容的提问来源于stack exchange，提问作者Hamed Salimian