public async Task <ActionResult> GetImage(GeoRect rect)
{
if (!ModelState.IsValid)
{
return(new JsonResult(ModelState));
}
var imgTask = await GetImageAsync(rect);
return(File(imgTask, "image/jpeg"));
}
public async Task <ActionResult> GetGeoJson(GeoRect rect)
{
if (!ModelState.IsValid)
{
return(new JsonResult(ModelState));
}
var jsonStr = await GetGeoJSON(rect);
return(Ok(jsonStr));
}
public async Task <ActionResult> GetImageMetadata(GeoRect rect)
{
if (!ModelState.IsValid)
{
return(new JsonResult(ModelState));
}
var str = await GetImageMetadataAsync(rect);
return(Ok(str));
}
private async Task <string> GetGeoJSON(GeoRect rect)
{
var httpStr = $"http://overpass-api.de/api/interpreter?data=[out:json];(node[\"building\"]({rect.MinLat},{rect.MinLon},{rect.MaxLat},{rect.MaxLon});way[\"building\"]({rect.MinLat},{rect.MinLon},{rect.MaxLat},{rect.MaxLon});relation[\"building\"]({rect.MinLat},{rect.MinLon},{rect.MaxLat},{rect.MaxLon}););out body;>;out skel qt;";
var http = new HttpClient();
var tsk = await http.GetAsync(httpStr);
var strTsk = await tsk.Content.ReadAsStringAsync();
Converter.FilesRoot = _he.WebRootPath + Path.DirectorySeparatorChar.ToString();
var converter = new Converter();
var geojson = converter.OsmToGeoJSON(strTsk);
return(geojson);
}
public async Task <byte[]> GetImageAsync(GeoRect rect)
{
var bingKey = Environment.GetEnvironmentVariable("BING_MAPS_KEY");
var httpStr = $"http://dev.virtualearth.net/REST/v1/Imagery/Map/Aerial?";
httpStr += $"mapArea={rect.MinLat},{rect.MinLon},{rect.MaxLat},{rect.MaxLon}";
httpStr += $"&mapSize=1500,1500";
httpStr += $"&key={bingKey}";
var http = new HttpClient();
var tsk = await http.GetAsync(httpStr);
tsk.EnsureSuccessStatusCode();
var bytesTsk = await tsk.Content.ReadAsByteArrayAsync();
return(bytesTsk);
}
public async Task <ActionResult> Get(GeoRect rect)
{
if (!ModelState.IsValid)
{
return(new JsonResult(ModelState));
}
var result = new MappingDto();
var geoJSONTask = GetGeoJSON(rect);
var imgTask = GetImageAsync(rect);
var imgMetadataTask = GetImageMetadataAsync(rect);
await Task.WhenAll(geoJSONTask, imgTask, imgMetadataTask);
result.GeoJSON = geoJSONTask.Result;
result.ImageData = new ImageDto
{
Image = imgTask.Result,
Metadata = imgMetadataTask.Result
};
return(Ok(result));
}