logo
down
shadow

Calculate length of road in a Polygon


Calculate length of road in a Polygon

By : Trinh Lam
Date : November 22 2020, 04:01 AM
hope this fix your issue This is probably better asked on gis stackoverflow.
That said, this is a multi-stage problem. I'd suggest something like:
code :


Share : facebook icon twitter icon
How do I calculate centroid of a polygon if the vertices of the polygon are given?

How do I calculate centroid of a polygon if the vertices of the polygon are given?


By : user3287331
Date : March 29 2020, 07:55 AM
Hope that helps http://en.wikipedia.org/wiki/Centroid#Centroid_of_polygon , I see the following issues:
ar, x, and y are not initialized.
code :
x+=((p[i].first+p[i+1].first)*ar);
y+=((p[i].second+p[i+1].second)*ar);
for(i=0;i<points-1;i++)
int main()
{
   int points;       
   scanf("%d",&points);
   pair<float,float>p[points];
   int i;
   for(i=0;i<points;i++)
   {
      scanf("%f %f",&p[i].first,&p[i].second);
   }

   float ar = 0.0;
   float x = 0.0;
   float y = 0.0;

   for(i=0;i<points;i++)
   {
      // This allows wrap-around when are you dealing with 
      // the last point in the list.
      int j = (i+1)%points;

      float common = (p[i].first*p[j].second - p[j].first*p[i].second);
      ar += common;
      x+=(p[i].first+p[j].first)*common;
      y+=(p[i].second+p[j].second)*common;
   }

   ar *= 0.5;
   x /= (6*ar);
   y /= (6*ar);

   printf("area: %.2f, xc: %.2f, yc: %.2f\n", ar, x, y);
}
Google Maps JavaScript API - Create Polygon from Polylines Snapped to Road

Google Maps JavaScript API - Create Polygon from Polylines Snapped to Road


By : iOS Developer
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Change the google.maps.Polyline to a google.maps.Polygon.
code :
var traceroadTrip1 = new google.maps.Polygon({
  path: roadTrip1,
  strokeColor: "red",
  strokeOpacity: 0.8,
  strokeWeight: 2,
  fillColor: '#FF0000',
  fillOpacity: 0.35
});
function initialize() {

  var pos = new google.maps.LatLng(29.813047, -95.399361);

  var myOptions = {
    zoom: 11,
    center: pos,
    mapTypeId: google.maps.MapTypeId.ROADMAP
  };

  var map = new google.maps.Map(document.getElementById('map'), myOptions);

  map.setCenter(pos);

  roadTrip1 = [
    new google.maps.LatLng(29.692093, -95.377307),
    new google.maps.LatLng(29.813047, -95.399361),
    new google.maps.LatLng(29.692093, -95.377307)
  ];

  var traceroadTrip1 = new google.maps.Polygon({
    path: roadTrip1,
    strokeColor: "red",
    strokeOpacity: 0.8,
    strokeWeight: 2,
    fillColor: '#FF0000',
    fillOpacity: 0.35
  });

  var service1 = new google.maps.DirectionsService(),
    traceroadTrip1, snap_path = [];
  var bounds = new google.maps.LatLngBounds();
  traceroadTrip1.setMap(map);
  for (j = 0; j < roadTrip1.length - 1; j++) {
    service1.route({
      origin: roadTrip1[j],
      destination: roadTrip1[j + 1],
      travelMode: google.maps.DirectionsTravelMode.DRIVING
    }, function(result, status) {
      if (status == google.maps.DirectionsStatus.OK) {
        snap_path = snap_path.concat(result.routes[0].overview_path);
        traceroadTrip1.setPath(snap_path);
        for (var i = 0; i < traceroadTrip1.getPath().getLength(); i++) {
          bounds.extend(traceroadTrip1.getPath().getAt(i));
        }
        map.fitBounds(bounds);
      }
    });


  }

}
google.maps.event.addDomListener(window, "load", initialize);
html,
body,
#map {
  height: 100%;
  width: 100%;
  margin: 0px;
  padding: 0px
}
<script src="https://maps.googleapis.com/maps/api/js"></script>
<div id="map"></div>
Calculate if circle fits inside of polygon (triangle/pentagon) given coordinates where touching the polygon is allowed?

Calculate if circle fits inside of polygon (triangle/pentagon) given coordinates where touching the polygon is allowed?


By : Jeff Yoak
Date : March 29 2020, 07:55 AM
I wish did fix the issue. The following assumes you already know that the center of the circle is inside the polygon. There are a few things you want to check as your definition that touching the vertices is ok adds some cornercases. This solution works for concave polygons as well.
Early check
How to calculate area of lots of polygon where each polygon has different coordinates

How to calculate area of lots of polygon where each polygon has different coordinates


By : user3094072
Date : March 29 2020, 07:55 AM
it fixes the issue Suppose I know 700 different values of x as well as another 700 different values of y coordinates. Every 7 points from my coordinates can construct a polygon. I can easily pick any formula (here I have used shoelace formula) to calculate the area of any polygon. But it's really tough to calculate area of each polygon in this way, is there any good way by which I can calculate the area of all polygon (for this case the total number of polygon is 100) at a time, e.g. by using any iteration. , Here's a vectorized way to get polygon areas for all -
code :
X = x.reshape(-1,7)
Y = y.reshape(-1,7)

Xr = np.roll(X,1,axis=1)
Yr = np.roll(Y,1,axis=1)
p1 = np.einsum('ij,ij->i',X,Xr)
p2 = np.einsum('ij,ij->i',Y,Yr)
Area_out = (p1-p2)/2
p1 = np.matmul(X[:,None,:],Xr[:,:,None])[:,0,0]
p1 = (X[:,None,:]@Xr[:,:,None])[:,0,0]
p1 = np.einsum('ij,ij->i',X[:,:-1],X[:,1:]) + X[:,0]*X[:,-1]
p2 = np.einsum('ij,ij->i',Y[:,:-1],Y[:,1:]) + Y[:,0]*Y[:,-1]
p1 = np.matmul(X[:,None,:-1],X[:,1:,None])[:,0,0] + X[:,0]*X[:,-1]
How Do I Calculate the Area of a Polygon in a MySQL Database When the Polygon's Points are Lat Longs?

How Do I Calculate the Area of a Polygon in a MySQL Database When the Polygon's Points are Lat Longs?


By : deendas
Date : March 29 2020, 07:55 AM
To fix this issue You've got to transform those lats and lons into a more appropriate coordinate system.
Since the earth is a sphere, you're talking about calculating an area in spherical coordinates.
Related Posts Related Posts :
  • Passing Query String Param into Response AWS API Gateway
  • Drive Api V3 - How to name file being uploaded?
  • IBM Watson speech to text WebSocket authorization with IAM API key
  • Why does ABAP cut string to one character?
  • Hide Taskbar button in FMX on Windows
  • Limit on the size of Azure table property that can be indexed by search?
  • How to authenticate to influxdb when using k6
  • How to customize the NSIS installer screens for multiple languages
  • How do I do a Depth First Search Alphabetically?
  • Updating already installed sideloaded uwp application
  • Formula returning previous month in `mmmm` format, only returns January
  • Postman API Tests
  • STRIPS Planner Doesn't Compile
  • WebCrypto AES-CBC outputting 256bit instead of 128bits
  • "File format not recognized" when building Petalinux app
  • Long living service with coroutines
  • Define data at cell centers using VTK format
  • Systemverilog interfaces over hierarchical boundaries
  • AIOHTTP:TypeError: index() takes 0 positional arguments but 1 was given
  • ProxySql Master node not serve the traffic untill slave gets shunned
  • Visual Studio 2019 Preview Remote Debugger
  • Setting composer (airflow) bucket using gcloud CLI
  • Cannot refresh subform from other subform
  • Email alert when field meets certain condition
  • MemSql > workaround for SELECT ... FOR UPDATE
  • Declarative Pipeline - Use of when condition, how to do nested conditions anyOf/allOf/not
  • Stateful microservices default 443 port share issue on the azure service fabric cluster
  • TYPO3 imagemagick makes images oversaturated
  • Typo-tolerant text searching?
  • How do I extract the components of a tuple in DAML?
  • Gimp 2.8.22: Change Color & Keep Transparency
  • I tried with this code, but it won't work with Ionic 3
  • Karate-Cucumber Report - No report file was added
  • Autofac - how to register a type used as a constructor parameter that requires the resolving (constructor) type as a gen
  • Tkinter filedialog is stealing focus and not returning it without "Alt-tab" in Python 3.4.1
  • jmeter dashboard report includes transaction controller children
  • Visual Branching in SourceTree
  • Doctrine2 orderBy in Symfony4 UnitTest
  • Match table-record to main-report dataset in Jaspersoft Studio
  • Drupal 8 custom module getting page not found
  • Is it possible that a container instance isn't really a container?
  • Padding not being understood in the UpSampling2D layer of a sequential layer
  • What is the incentive for a participating node in a "Proof of Stake" consensus model of Blockchain?
  • Radial gradient on a node in cytoscape
  • How to create operators from list in Airflow?
  • Is bitly supported for Native Script?
  • Reading log data records from a BLE device
  • How to add aliases in yii2?
  • XPages - Bootstrap popover
  • Misleading exception message in GatewayMethodInboundMessageMapper with un-annotated parameters
  • Inno Setup Disable Next button using multiple validation expressions (when input value matches one of multiple values)
  • 'reference to setCapability is ambiguous' on Appium Java project for Android Caps
  • Quartz .net - Abort/Stop Current Execution of Job & Pause All the triggers
  • Can Signal have zero recipients in BPMN?
  • Perl6: .sort() doesn't use overridden cmp
  • Find a directory using wildcard in Inno Setup
  • Getting error trying to formrequest login page via scrapy shell
  • Botframework Dialog migration v3 to v4
  • How to load resources from classpath in itext7?
  • How to inject a java value in XSLT Saxon template?
  • shadow
    Privacy Policy - Terms - Contact Us © bighow.org