ACCURATE DIGITIZATION OF A GEOREFERENCED IMAGE

• US 20110235923A1
• Filed: 06/03/2011
• Published: 09/29/2011
• Est. Priority Date: 09/14/2009
• Status: Active Grant

• Current Assignee: Trimble Inc.
• Original Assignee: Trimble Navigation Limited (Trimble Inc.)
• Inventors: France, Peter G., Weisenburger, Shawn D., Janky, James M.
• Granted Patent: US 8,897,541 B2
• Time in Patent Office: Days
• US Class Current: 382/201
• CPC Class Codes: G01C 11/00 Photogrammetry or videogrammetry, e.g. stereogrammetry; Photographic surveying
• CPC Class Codes: G01C 15/00 Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
• CPC Class Codes: G06T 2207/10032 Satellite or aerial image; Remote sensing
• CPC Class Codes: G06T 2207/30184 Infrastructure
• CPC Class Codes: G06T 7/73 using feature-based methods
• CPC Class Codes: Y10S 707/919 Geographic

Abstract

A method of implementing accurate digitization from a georeferenced image is described. In one embodiment, at least one set of coordinates which have been measured at a point of interest is received. A correction is then determined which describes a difference between the at least one set of coordinates and a set of georeferenced coordinates from a georeferenced image of the point of interest which describes the position of the point of interest.

Claims

1. A method of implementing accurate digitization from a georeferenced image, said method comprising:

receiving at least one set of coordinates which have been measured at a point of interest; and

determining a correction which describes a difference between said at least one set of coordinates and a set of georeferenced coordinates from a georeferenced image of said point of interest which describes the position of said point of interest.

2. The method of claim 1 further comprising:

applying said correction to a second set of georeferenced coordinates of said georeferenced image to describe the position of a second point of said georeferenced image.

3. The method of claim 1 further comprising:

receiving a plurality of sets of coordinates which have been measured at a plurality of points of interest; and

using said plurality of sets of coordinates to determine the position of a second point of interest within said georeferenced image.

4. The method of claim 1 wherein said at least one set of coordinates is collected in response to a message to measure the position of said point of interest.

5. The method of claim 1 wherein said at least one set of coordinates is collected in response to a message to measure the position of said point of interest with a greater level of precision.

6. The method of claim 1 further comprising:

comparing said at least one set of coordinates with said set of georeferenced coordinates;

determining that said at least one set of coordinates more precisely describes the position of said point of interest; and

replacing said set of georeferenced coordinates with said at least one set of coordinates to describe the position of said point of interest within said georeferenced image.

7. The method of claim 1 further comprising:

modifying data in a world file associated with said georeferenced image based upon said correction and wherein said world file is used to derive a set of georeferenced coordinates of said point of interest within said georeferenced image.

8. A system for implementing accurate digitization from a georeferenced image comprising:

a feature locator configured to receive at least one set of coordinates which have been measured at a point of interest;

an registration comparer configured to determine whether a level of accuracy associated said at least one set of coordinates is greater than a second level of accuracy associated a set of georeferenced coordinates which describe the position of said point of interest within a georeferenced image, and

a correction generator configured to determine a correction which describes a difference between said at least one set of coordinates and said set of georeferenced coordinates.

9. The system of claim 8 further comprising:

a registration updater configured to modify data in a world file associated with said georeferenced image based upon said correction and wherein said world file is used to derive a set of georeferenced coordinates of said point of interest within said georeferenced image.

10. The system of claim 9 wherein said registration updater is further configured to apply said correction to a second set of georeferenced coordinates of said georeferenced image to describe the position of a second point of interest within said georeferenced image.

11. The system of claim 9 wherein said registration updater is further configured to replace said set of georeferenced coordinates with said at least one set of coordinates to describe the position of said point of interest within said georeferenced image.

12. The system of claim 8 wherein said feature locator is further configured to receive a plurality of coordinates which have been measured at a plurality of points of interest and wherein said correction is used to describe the position of a second point of interest within said georeferenced image.

13. The system of claim 8 wherein said feature locator is configured to initiate a message to measure the position of said point of interest.

14. The system of claim 8 further comprising:

an accuracy validator configured to initiate a message measure the position of said point of interest with a greater level of precision.

15. A computer implemented method comprising:

using a computer system to receive at least one set of coordinates which have been measured at a point of interest;

using said computer system to determine a correction which describes a difference between said at least one set of coordinates and a set of georeferenced coordinates which describe the position of said point of interest within a georeferenced image; and

using said computer system to apply said correction to a second set of coordinates of said georeferenced image to describe the position of a second point of said georeferenced image.

16. The computer implemented method of claim 15 further comprising:

using said computer system to determine that said at least one set of coordinates more precisely describes the position of said point of interest within said georeferenced image than said set of georeferenced coordinates; and

using said computer system to replace said set of georeferenced coordinates with said at least one set of coordinates to describe the position of said point of interest within said georeferenced image.

17. The computer implemented method of claim 15 further comprising:

receiving by said computer system a plurality of coordinates which have been measured at a plurality of points of interest; and

using by said computer system said plurality of coordinates to determine the position of a second point of interest within said georeferenced image.

18. The computer implemented method of claim 15 further comprising:

using said computer system to initiate a message to measure the position of said point of interest.

19. The computer implemented method of claim 15 further comprising:

using said computer system to initiate a message measure the position of said point of interest with a greater level of precision.

20. The computer implemented method of claim 15 further comprising:

using said computer system to modify data in a world file associated with said georeferenced image based upon said correction and wherein said world file is used to derive a set of georeferenced coordinates of said point of interest within said georeferenced image.