Elevation Index

Elevation Index POST Request - Prepare TIFF

The Elevation Index API offers a means of computing four elevation indices for an elevation raster that is passed to the service. The four indices are relative elevation, slope, topographic position index (TPI), and terrain ruggedness index (TRI). When using the API, the client can specify the particular indices that should be calculated for the elevation raster and there are options for a few tuning parameters relating to TPI and TRI. The intent behind the service is to provide farmers and producers with the ability to extract more information about the elevation of their field and the relationship with parameters such as wetness and yield. The correlation between these indices and yield is most often due to the way water is transported across sections of a farm field (i.e., correlation with chronically dry and wet areas).

POST Request Example of Relative Elevation.

Request Parameters

Parameter	Data Type	Required?	Default	Options	Description
Shape	geojson	Yes	--	geojson	Geojson area of interest to return
index_list	List of indices as a string	Yes	--	"Relative_Elevation" "Slope" "TPI" "TRI"	Indices that should be calculated for the input geojson
Inside_Radius	Integer as string	No	3	0<Outside_Radius<20	Outer radius of window for computing TPI
Outside_Radius	Integer as string	No	1	0<=Inside_Radius <Outside_Radius	Inner radius of window for computing TPI
Search_Radius	Integer as string	No	1	0 < Search_Radius	Radius of window for computing TRI
Legend_Range	Integer as string	No	3	0 < Legend_Range	Number of ranges to display in png of output image

Response Parameters

Parameter	Data Type	Required?
Features	List	Container for all of the features of the DEM raster.
Features.attributes (F.a)	Dictionary	Each feature in Features has an associated attributes dictionary.
F.a.CellSize	List	Resolution as x,y cell size. In units of projection.
F.a.CoordinateSystem	String	Projection in WKT
F.a.Extent	String	Extent of result geotiff.
F.a.Legend (F.a.L)	List	Each range in the output PNG is represented by a separate dictionary.
F.a.L.Area	String	Percent of total image that the particular range of values covers.
F.a.L.Count	Int	Number of pixels that a particular range takes up in the png.
F.a.L.CountAllPixels	Int	Total number of pixels in the png image.
F.a.L.Max	Float	Maximum value in the range.
F.a.L.Mean	Float	Mean value of the range.
F.a.L.Min	Float	Min value of the range.
F.a.L.color	String	Hex value that is used to display the png image.
F.a.Matrix	List	Dimensions of output image.
F.a.Max	Float	Maximum value of entire raster.
F.a.Mean	Float	Mean value of entire raster.
F.a.Min	Float	Min value of entire raster.
F.a.OID	Int	Deprecated
F.a.Percentile5	Float	5th percentile value.
F.a.Percentile95	Float	95th percentile value.
F.a.Std	Float	Standard deviation of raster values.
F.a.Variet	String	Either Variety or NoVariety. Flag for category or continuous data.
F.a.pngb64	String	The png image returned in base64 encoding.
FileName	String	Name of result raster that was generated in POST request. Used in GET request to retrieve GeoTiff file.
Index_Files	List	List of elevation index files that can be used in GET request to return the GeoTiffs.

Call API

Request

Request URL

https://ag-analytics.azure-api.net/elevation-index/

Request headers

Content-Type (optional)

string

Request body

application/json

{
    "Inside_Radius": "3",
    "Legend_Range": "10",
    "Outside_Radius": "5",
    "Search_Radius": "2",
    "Shape": "{\"type\":\"Feature\",\"geometry\":{\"type\":\"Polygon\",\"coordinates\":[[[-76.5907145, 42.443918], [-76.5898132, 42.4224745], [-76.5699863, 42.4230447], [-76.5710592, 42.4443296], [-76.5907145, 42.443918]]]},\"properties\":{\"OBJECTID\":4944402,\"CALCACRES\":46.15999985,\"CALCACRES2\":null},\"id\":4944402}",
    "index_list": "['Relative_Elevation']"
}

Responses

200 OK

Success Example

Representations

application/json

{"Slope": "raster_Slope_60326.tif", "features": [[{"attributes": {"CellSize": [9.259259269220297e-05, -9.259259269220297e-05], "CoordinateSystem": "GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433],AUTHORITY["EPSG","4326"]]", "Extent": "-76.4984894, 42.44091207776192, -76.47552643701233, 42.455634299999986", "Legend": [{"Area": "33.33 %", "Count": 12550, "CountAllPixels": 37649, "Max": 0.0182556863874197, "Mean": 0.009127915863693659, "Min": 1.4533996761656454e-07, "color": "#4d76d5"}, {"Area": "33.33 %", "Count": 12549, "CountAllPixels": 37649, "Max": 0.0475408136844635, "Mean": 0.0328982500359416, "Min": 0.0182556863874197, "color": "#e5cc78"}, {"Area": "33.33 %", "Count": 12550, "CountAllPixels": 37649, "Max": 0.8181570172309875, "Mean": 0.4328489154577255, "Min": 0.0475408136844635, "color": "#e9e9e9"}], "Matrix": [159, 248], "Max": 0.8181570172309875, "Mean": 0.05745059624314308, "Min": 1.4533996761656454e-07, "OID": 0, "Percentile5": 0.0029396485537290574, "Percentile95": 0.21061243116855616, "Product": "Slope", "Std": 0.08429117575830632, "Variety": "NoVariety", "pngb64": "data:image/png;base64, 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"}}]]}

Code samples

@ECHO OFF

curl -v -X POST "https://ag-analytics.azure-api.net/elevation-index/"
-H "Content-Type: application/json"

--data-ascii "{body}"

using System;
using System.Net.Http.Headers;
using System.Text;
using System.Net.Http;
using System.Web;

namespace CSHttpClientSample
{
    static class Program
    {
        static void Main()
        {
            MakeRequest();
            Console.WriteLine("Hit ENTER to exit...");
            Console.ReadLine();
        }
        
        static async void MakeRequest()
        {
            var client = new HttpClient();
            var queryString = HttpUtility.ParseQueryString(string.Empty);

            // Request headers

            var uri = "https://ag-analytics.azure-api.net/elevation-index/?" + queryString;

            HttpResponseMessage response;

            // Request body
            byte[] byteData = Encoding.UTF8.GetBytes("{body}");

            using (var content = new ByteArrayContent(byteData))
            {
               content.Headers.ContentType = new MediaTypeHeaderValue("< your content type, i.e. application/json >");
               response = await client.PostAsync(uri, content);
            }

        }
    }
}

// // This sample uses the Apache HTTP client from HTTP Components (http://hc.apache.org/httpcomponents-client-ga/)
import java.net.URI;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.utils.URIBuilder;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

public class JavaSample 
{
    public static void main(String[] args) 
    {
        HttpClient httpclient = HttpClients.createDefault();

        try
        {
            URIBuilder builder = new URIBuilder("https://ag-analytics.azure-api.net/elevation-index/");


            URI uri = builder.build();
            HttpPost request = new HttpPost(uri);
            request.setHeader("Content-Type", "application/json");


            // Request body
            StringEntity reqEntity = new StringEntity("{body}");
            request.setEntity(reqEntity);

            HttpResponse response = httpclient.execute(request);
            HttpEntity entity = response.getEntity();

            if (entity != null) 
            {
                System.out.println(EntityUtils.toString(entity));
            }
        }
        catch (Exception e)
        {
            System.out.println(e.getMessage());
        }
    }
}

<!DOCTYPE html>
<html>
<head>
    <title>JSSample</title>
    <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js"></script>
</head>
<body>

<script type="text/javascript">
    $(function() {
        var params = {
            // Request parameters
        };
      
        $.ajax({
            url: "https://ag-analytics.azure-api.net/elevation-index/?" + $.param(params),
            beforeSend: function(xhrObj){
                // Request headers
                xhrObj.setRequestHeader("Content-Type","application/json");
            },
            type: "POST",
            // Request body
            data: "{body}",
        })
        .done(function(data) {
            alert("success");
        })
        .fail(function() {
            alert("error");
        });
    });
</script>
</body>
</html>

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    
    NSString* path = @"https://ag-analytics.azure-api.net/elevation-index/";
    NSArray* array = @[
                         // Request parameters
                         @"entities=true",
                      ];
    
    NSString* string = [array componentsJoinedByString:@"&"];
    path = [path stringByAppendingFormat:@"?%@", string];

    NSLog(@"%@", path);

    NSMutableURLRequest* _request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:path]];
    [_request setHTTPMethod:@"POST"];
    // Request headers
    [_request setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];
    // Request body
    [_request setHTTPBody:[@"{body}" dataUsingEncoding:NSUTF8StringEncoding]];
    
    NSURLResponse *response = nil;
    NSError *error = nil;
    NSData* _connectionData = [NSURLConnection sendSynchronousRequest:_request returningResponse:&response error:&error];

    if (nil != error)
    {
        NSLog(@"Error: %@", error);
    }
    else
    {
        NSError* error = nil;
        NSMutableDictionary* json = nil;
        NSString* dataString = [[NSString alloc] initWithData:_connectionData encoding:NSUTF8StringEncoding];
        NSLog(@"%@", dataString);
        
        if (nil != _connectionData)
        {
            json = [NSJSONSerialization JSONObjectWithData:_connectionData options:NSJSONReadingMutableContainers error:&error];
        }
        
        if (error || !json)
        {
            NSLog(@"Could not parse loaded json with error:%@", error);
        }
        
        NSLog(@"%@", json);
        _connectionData = nil;
    }
    
    [pool drain];

    return 0;
}

<?php
// This sample uses the Apache HTTP client from HTTP Components (http://hc.apache.org/httpcomponents-client-ga/)
require_once 'HTTP/Request2.php';

$request = new Http_Request2('https://ag-analytics.azure-api.net/elevation-index/');
$url = $request->getUrl();

$headers = array(
    // Request headers
    'Content-Type' => 'application/json',
);

$request->setHeader($headers);

$parameters = array(
    // Request parameters
);

$url->setQueryVariables($parameters);

$request->setMethod(HTTP_Request2::METHOD_POST);

// Request body
$request->setBody("{body}");

try
{
    $response = $request->send();
    echo $response->getBody();
}
catch (HttpException $ex)
{
    echo $ex;
}

?>

########### Python 2.7 #############
import httplib, urllib, base64

headers = {
    # Request headers
    'Content-Type': 'application/json',
}

params = urllib.urlencode({
})

try:
    conn = httplib.HTTPSConnection('ag-analytics.azure-api.net')
    conn.request("POST", "/elevation-index/?%s" % params, "{body}", headers)
    response = conn.getresponse()
    data = response.read()
    print(data)
    conn.close()
except Exception as e:
    print("[Errno {0}] {1}".format(e.errno, e.strerror))

####################################

########### Python 3.2 #############
import http.client, urllib.request, urllib.parse, urllib.error, base64

headers = {
    # Request headers
    'Content-Type': 'application/json',
}

params = urllib.parse.urlencode({
})

try:
    conn = http.client.HTTPSConnection('ag-analytics.azure-api.net')
    conn.request("POST", "/elevation-index/?%s" % params, "{body}", headers)
    response = conn.getresponse()
    data = response.read()
    print(data)
    conn.close()
except Exception as e:
    print("[Errno {0}] {1}".format(e.errno, e.strerror))

####################################

require 'net/http'

uri = URI('https://ag-analytics.azure-api.net/elevation-index/')


request = Net::HTTP::Post.new(uri.request_uri)
# Request headers
request['Content-Type'] = 'application/json'
# Request body
request.body = "{body}"

response = Net::HTTP.start(uri.host, uri.port, :use_ssl => uri.scheme == 'https') do |http|
    http.request(request)
end

puts response.body