Tips on adding up polygon values in mapbox

Question

Tips on adding up polygon values in mapbox

After providing detailed information about my issue, I was criticized for seeking help, so I will be more general in my explanation. I am trying to calculate the sum of values for each location within a polygon drawn on Mapbox. I have the code to insert the draw polygon tool, draw the polygon, and display the summed values on the left side of the map. However, the calculated value is incorrect and I am unsure why. I am feeling frustrated and at a loss. Can anyone offer insight into this issue?

While browsing other posts on stackoverflow, I have gathered that seeking help is acceptable when encountering problems. I am open to receiving advice and guidance on how to fix my code. I am not asking to be spoonfed; I genuinely want to comprehend the issues with my code and learn from them. If you require access to my code, please let me know.

javascript mapbox polygon mapbox-gl-js mapbox-gl

Answer 1

Answer №1

Providing specific guidance without access to your code can be challenging, but here are some general steps you can follow to calculate the total values of locations within a polygon using Mapbox:

Draw a polygon on the map using the Mapbox Draw tool.
Retrieve the polygon coordinates with the help of the Mapbox GL JS library.
Iterate through each point within the polygon and determine if it belongs to a specific location.
If a point is within a location, add its value to the running total.
Display the cumulative value for the polygon in a designated area on the map.

// Obtain the polygon coordinates
const polygon = map.getSource('draw')._data.features[0].geometry.coordinates[0];

// Iterate through each point in the polygon
let total = 0;
for (let i = 0; i < polygon.length; i++) {
  const point = polygon[i];

  // Check if the point falls within a location's boundaries
  const locations = getLocations();
  for (let j = 0; j < locations.length; j++) {
    const location = locations[j];

    if (point[0] >= location.minLon && point[0] <= location.maxLon &&
        point[1] >= location.minLat && point[1] <= location.maxLat) {
      total += location.value;
    }
  }
}

// Display the total value for the polygon
document.getElementById('total').textContent = total;

Make sure that the getLocations() function returns an array of objects representing each location on the map, with properties like minLon, maxLon, minLat, maxLat, and value indicating the longitude, latitude, and value of the location.

Answer 2

Providing specific guidance without access to your code can be challenging, but here are some general steps you can follow to calculate the total values of locations within a polygon using Mapbox:

Draw a polygon on the map using the Mapbox Draw tool.
Retrieve the polygon coordinates with the help of the Mapbox GL JS library.
Iterate through each point within the polygon and determine if it belongs to a specific location.
If a point is within a location, add its value to the running total.
Display the cumulative value for the polygon in a designated area on the map.

// Obtain the polygon coordinates
const polygon = map.getSource('draw')._data.features[0].geometry.coordinates[0];

// Iterate through each point in the polygon
let total = 0;
for (let i = 0; i < polygon.length; i++) {
  const point = polygon[i];

  // Check if the point falls within a location's boundaries
  const locations = getLocations();
  for (let j = 0; j < locations.length; j++) {
    const location = locations[j];

    if (point[0] >= location.minLon && point[0] <= location.maxLon &&
        point[1] >= location.minLat && point[1] <= location.maxLat) {
      total += location.value;
    }
  }
}

// Display the total value for the polygon
document.getElementById('total').textContent = total;

Make sure that the getLocations() function returns an array of objects representing each location on the map, with properties like minLon, maxLon, minLat, maxLat, and value indicating the longitude, latitude, and value of the location.

Tips on adding up polygon values in mapbox

Answer №1

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