# US 2023/0056849 A1 · Method for georeferencing remote sensing data

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- Number: US 2023/0056849 A1
- Document ID: US20230056849A1
- Status: Published application
- Kind: A1
- Application number: 17/797,482
- Filed: 2021-02-08
- Published: 2023-02-23
- Earliest claimed: 2020-02-07
- Assignees: Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
- Applicants: Fraunhofer-Gesellschaft Zur Forderung Der Angewandten Forschung E.V.
- Inventors: Max GULDE
- Web page: https://patentgrep.com/patent/US20230056849A1

## CPC

- G01C 11/08: the pictures not being supported in the same relative position as when they were taken
- G01C 21/3852: {Data derived from aerial or satellite images}
- G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S)

## Abstract

The invention relates to a method for georeferencing remote sensing data of a remote sensing platform. According to the invention, a remote sensing dataset is received by the received sensing platform, which maps a visual range of the ground surface, and a georeferencing of the remote sensing dataset is determined using a reference dataset with known georeferencing.

## Claims

### Claim 1

A method for georeferencing remote sensing data of a remote sensing platform,
recording a remote sensing data set by the remote sensing platform which depicts a visual range of earth's surface,
a reference data set with known georeferencing is determined, wherein the reference data set depicts a portion of the earth's surface which overlaps at least partially with a visual range,
during a first adjustment step a remote sensing data set and the reference data set are compared to each other, and
in a second adjustment step, a morphology operation is applied to the remote sensing data set or the reference data set based on the comparison,
repeating the first adjustment step and the second adjustment step until it is determined in the first adjustment step by comparing as a termination condition that the remote sensing data set and the reference data set differ from each other by less than a predefined threshold,
in the event of the termination condition occurring, the georeferencing of the reference data set is set as the georeferencing of the remote sensing data set after application of the at least one executed morphology operation.

### Claim 2 (depends on 1)

The method according to claim 1, wherein a spatial resolution of the remote sensing data set and a spatial resolution of the reference data set are brought into correspondence for comparison in the first adjustment step.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the resolution of the one of the remote sensing data set and the reference data set having the higher resolution is reduced to the resolution of an other of the remote sensing data set and the reference data set.

### Claim 4 (depends on 2)

The method according to claim 2,
wherein the remote sensing data set and the reference data set are values given in pixels of at least one measurement parameter,
wherein for comparison in the first adjustment step a difference data set is created from the remote sensing data set and the reference data set having a number of pixels equal to a number of pixels of a data set with reduced resolution, wherein for amount of all positions of pixels of the difference data set, a pixel with position i of the difference data set has as its value a difference between values of a pixel of the remote sensing data set with the same position i and a pixel of the reference data set with the same position i.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the predefined threshold is a threshold value which is compared to value Diff=√(Σ_i(IA,i−IRef,i)2), wherein IA,i is a value of the pixel at position i of the remote sensing data set and IRef,i is a value of the pixel at position i of the reference data set.

### Claim 6 (depends on 1)

The method according to claim 1, wherein a morphology transformation includes at least one translation, at least one rotation and/or at least one perspective distortion of a corresponding data set.

### Claim 7 (depends on 1)

The method according to claim 1, wherein a calibration of the remote sensing data set and a calibration of the reference data set are adapted to each other prior to the first adjustment step.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the remote sensing platform is a satellite, an unmanned aerial vehicle or a drone.

### Claim 9 (depends on 1)

The method according to claim 1, wherein a preliminary georeferencing of the remote sensing platform is estimated for determination of the reference data set.

### Claim 10 (depends on 1)

The method according to claim 1, wherein the remote sensing data set and the reference data set are recorded in a same spectral range.

### Claim 11 (depends on 1)

The method according to claim 1, wherein the remote sensing data set and/or the reference data set are recorded in a infrared range.

### Claim 12 (depends on 1)

The method according to claim 1, wherein the reference data set is recorded at a time interval from the remote sensing data of at most 24 hours.