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  Measuring a bearing (direction) in a map

  Calculate Distance Area and Perimeter in a Map

  Accuracy map

  

  

  

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This tool aims to obtaining geographic coordinates (latitude, longitude, location, street address, points ...), distance of a polyline or area on Google interactive map, it's easy to use, you have different mode to get information (point, distance, polyline, area ).
When you click (single left click) on the map create a marker that contain street address, latitude and longitude, you can view this information simply by clicking (single right click) on the marker.
Click on the map to find coordinates (Latitude and Longitude) of a location.
Street address, Map Coordinate (Longitude/Latitude) Finder.
With this tool get lat/lon without the workaround: javascript:void(prompt('',gApplication.getMap().getCenter()))

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Measuring a bearing (direction) in a map

A bearing is a measurement of direction between two points in the earth. There are two formats for the Bearings, an azimuth bearing or a quadrant bearing.
An azimuth bearing indicate direction in degree, north as 0°, east 90°, south 180°, and west 270° (the compass is numbered clockwise from 0° to 360°).
For quadrant bearings the compass is divided into four sections, each containing 90°. Quadrant bearings are given in the format of N 42°E (northeast), S 13°W (southwest), ...
To determine the bearing from two point (from point A to point B) in a map, is to carry a protractor with you when you’re in the field. If you have a protractor with you, place it on the map so it is oriented parallel to a north-south gridline, with the center of the protractor on point A (or on a line drawn between points A and B). Once you have done this, you can simply read the bearing you need to go off of the protractor.
If you have a computer connected to the internet you can use the tool of this web page, using the mode distance or polyline, save the point A where you want to measure the bearing (orientation), then with another click on the map appears a second marker, high in the field text value will be displayed the value, for example, | dir: 352.58° |.

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Calculate Distance Area and Perimeter in a Map

Distance mode, polyline and aera, for each click on the map will show the total length of the segments joining the starting point to final, in addition is computed direction between the last two points of the polyline.
Mode area for each click adds a vertex and a polygon is drawn on the map at any time you can move the vertices by dragging the map, the value of the area is updated automatically.
In the top field displays the extent of the area highlighted, and the length of the perimeter of the polygon.
The calculation of a surface directly on an online map, is useful for a quick assessment of the available area for a photovoltaic system, and therefore the maximum power installed.
Value of bering used to determine what the azimuth of a roof or ground to assess the performance of a photovoltaic or solar thermal.

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Accuracy map

The mathematical model used approximates the earth to a sphere with a radius of 6378137 meters, so the calculation of distance might have an error of 0.3%, particularly in the polar extremes, and for long distances through various parallel.
The spherical model also affects the calculation of the bearing or direction (the error increases with distance). If we take the extreme case, consider two diametrically opposite points on the equator the shortest path does not pass through the equator but to the pole, then the bearing will not be 90° or 270° (depending on the direction of travel) but 0° or 180°, for all other cases we will have intermediate values.
If the measure of direction was made a map a plane we will have the same problem.
For short distances the error becomes irrelevant.

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http://code.google.com/apis/maps/documentation/reference.html
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