Regard3D is a structure-from-motion program. That means, it can create 3D models from objects using a
series of photographs taken of this object from different viewpoints.


To obtain a 3D model, the following steps are performed:

* For each image, features (sometimes also called keypoints) are detected. Features are points in an object
  that have a high probability to be found in different images of the same object, for example corners, edges
  etc. Regard3D uses A-KAZE for this purpose.

* For each feature, a mathematical descriptor is calculated. This descriptor has the characteristic that
  descriptors of the same point in an object in different images (seen from different viewpoints) is similar.
  Regard3D uses LIOP (Local Intensity Order Pattern) for this purpose.

* The descriptors from different images are matched and geometrically filtered. The result of this step is a
  collection of matches between each image pair.

* Now &quot;tracks&quot; are calculated. For each feature that is part of a match in an image pair, it is searched also in
  other images. A track is generated from features if these features satisfy some conditions, for example a
  track is seen in at least 3 images.

* The next step is the triangulation phase. All the matches of all the image pairs are used to calculate:

* The 3D position and characteristic of the &quot;camera&quot;, i.e. where each image was shot and the visual
characteristics of the camera

* The 3D position of each &quot;track&quot; is calculated

* The result of the triangulation phase is a sparse point cloud. In order to obtain a more dense point cloud
  (&quot;densification&quot;), several algorithms can be used.

* The last step is called &quot;Surface generation&quot;. The point clouds are used to generate a surface, either with
  colored vertices or with a texture.


Helpful link:
https://en.wikipedia.org/wiki/Photogrammetry
https://en.wikipedia.org/wiki/Structure_from_motion 

Regard3D

Windows

Linux

Regard3D is a free, multiplatform, open-source structure-from-motion application. It creates 3D models of objects, based on photographs from different angles.

Golfshot is the #1 provider of pre-mapped aerial image courses. View available courses and request more for free at www.golfshot.com

GPS requires an iPhone or GPS-enabled iPad. 

Continued use of GPS running in the background can dramatically decrease battery life. View battery-saving tips and all the amazing features in the User Guide available at www.golfshot.com/userguide.pdf

Golfshot

Android

iPhone

iPad

Android Wear

Golfshot is the #1 provider of pre-mapped aerial image courses. View available courses and request more for free at www.golfshot.com

Garmin Connect is a community-based website for runners, cyclists and outdoor enthusiasts who track their activities with Garmin devices. Garmin Connect makes it easy to upload, store, analyze, map and share activities online.

Garmin Connect

Windows Phone

Garmin Connect is a community-based website for runners, cyclists and outdoor enthusiasts who track their activities with Garmin devices.

This is the best free tool for you when you want to purchase some property, and want to calculate the area of that property. Geo Measure will help you like your best friends and will give you the exact calculated area.

The Geo measure area calculator is an excellent GPS field area map measurement tool as an app. It helps you greatly in measuring anywhere, while you are traveling someplace if you want to calculate the distance between two points and cities. It is a bright GPS and land surveying app. It is used to farm and google mapping measure distance in fast. Even, it assistance you well to check area converter, their units, and conversion in easy.

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Geo Measure Area Calculator

Geo measure area calculator app is major for the GPS fields and land surveying. It helps you to google maps, measurement. Check the distance between two points cities.

Apps with 'Measure Distance With GPS' feature

Regard3D

Golfshot

Garmin Connect

Geo Measure Area Calculator