Layer properties

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General information of a layer

Click on the layer to visualize its general information such as dimension, GSD, file size, data type, coordinate system, the order of the bands, acquisition, and radiometry correction type.

Color mode

Pix4Dfields offers different visualization of the layers:

colorotherindices.png Color_DSM.png
Other indices DSM

 

  • Grayscale: The index image is colored with shades of gray, where pixels with lowest index value are black and the pixels are brighter with increasing index value. That is the way each raw image per band appears when opened with a standard image viewer application.
  • Red-Green: The "standard" view - the color scale ranges from red to green.
  • Thermal: This skin is visualized on the scale of black/purple to yellow/white. This is not a thermal map (it does not represent temperature values)
  • Spectral: The color scale goes from blue to red.
  • DSM: This skin is designed for the DSM (digital surface model) and helps visualize depth change from blue to orange on the scale.

Dimensions

The dimensions (in pixels) of a layer depends on the area covered by the input images and the GSD.

GSD

The Ground Sampling Distance (GSD) is the distance between two consecutive pixel centers measured on the ground. The higher the GSD value, the fewer details that are visible on the ground (less spatial resolution). The GSD value and spatial resolution are closely related to the altitude of the drone flight and can be determined by the settings in the advanced processing options. For more information about GSD: here.

 
Note: A GSD of 5 cm means that one pixel in the image represents linearly 5 cm on the ground (5*5 = 25 square centimeters).

File Size

The file size depends on the number of pixels and the number of bits of your images. If radiometry correction was enabled, the orthomosaic would have 32-bit float pixels.

 
Note: There are no limitations on the size of the area that can be processed in Pix4Dfields. The restrictions may be imposed by the processing power of your device.

Data Type

Pix4Dfields supports TIFF images with 8, 10, 12, 14, and 16 bit integers, and floating-point as inputs. For more information about inputs and outputs: here

Coordinate System

Shows the coordinate system of the input data.

Bands

This section displays the bands that your sensor has. The order of the bands displayed on Pix4Dfields depends on the Xmp.Camera.BandName tag defined by your camera manufacturer. More information about Exif and Xmp tags: here

 
Note: The Alpha band is used for the transparency of the orthomosaic, and it has no data..

Acquisition

Shows the time of acquisition and the duration of your flight. This information is taken from the Exif.GPSInfo.GPSTimeStamp tag of your dataset.

Note: If the Exif.GPSInfo.GPSTimeStamp tag is not on your images, then the acquisition information will not be available.

Radiometric Correction Type

The radiometric correction type that Pix4Dfields used on your project can be seen when clicking the corresponding orthomosaic.

Pix4Dfields performs different types of radiometric correction, depending on the availability of the following sources: Image EXIF tags, sunshine sensor, reflectance targets, thermal profile, and weather conditions during the capture. For more information about radiometric correction: here

 

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