Cut the study area from the Satellite imagery


Definition of space visual

Space visualization is a digital image of a phenomenon taken by an electronic pickup that records the energy reflected or emitted from ground targets and is expensive to carry the pickup on aircraft in the atmosphere, and the digital image is kept in a file recorded on electronic storage devices dealing directly with the computer.

This file containing the digital image may be displayed on the display, and what we see on this screen is an image similar to any other image taken by cameras.

The difference, however, is that this image displayed on the screen is basically digital and has been transformed into an analogue body similar to the aerial image of this aerial image consisting of a large set of numbers distributed in the form of a matrix with horizontal and vertical axes and a horizontal axis called X, and vertical called Y, and each number is called a pixel cell.

So the image consists of a matrix of cells divided into two axes, one horizontal and the other vertical, and the horizontal matrix called rows, either vertical, called columns, and usually selects points starting with a first row meeting and the first column at the far left top corner of the image, so that the last row meets the last column at the far right bottom corner of the image.

The image and if we want to identify a cell on the image we identify it by looking at its location from rows and columns, the space video is the images that are taken by sensors installed on satellite devices, the camera when photographing a landscape that captures light through the lens inside this camera to the sensor behind the CCD lens, the lens receives this light and cuts it into millions of small squares called pixels, each square stores this light in the form of a amount of Energy (electromagnetic field).

Cut the study area from the Satellite imagery

After uploading the space video containing the study area, and bringing the regulatory boundary file, The visual is cut off from these limits for later study.

It is deducted using arc Toolbox’s Raster Clip tool

By following the following steps:

Cut the study area from the Satellite imagery

1-Add the border file to the space image after confirming the projection system that it is identical to the image projection system, where it will appear in this form:

Cut the study area from the Satellite imagery

2-After pressing the clip tool with two clicks, this window appears where we put in the input Raster image and in the output Extent shape file, which represents the cutting limits:

Cut the study area from the Satellite imagery

3-Then press ok the required piece of the image appears as follows:

Cut the study area from the Satellite imagery

Leave A Reply

Your email address will not be published.