## Introduction
-----
In order to access and view the geometry for an ISIS image cube \[raw
instrument camera cube, (i.e., PDS-EDR)\], the application
[**spiceinit**](http://isis.astrogeology.usgs.gov/Application/presentation/Tabbed/spiceinit/spiceinit.html)
must be **successfully** applied to the cube. Once **spiceinit** has
been applied, there are a number of applications that will be able to
compute and output statistics about your image based on the raw **Camera
Geometry** .
## Camera Geometry
-----
**Camera Geometry** refers to the viewing geometry of an observation. It
also implies a 'non-projected' cube (sometimes referred to as a Level1,
though it does not require radiometric calibration).
!!! Note "Within the ISIS environment, unless otherwise specified, **ALL** applications default (for input and output) to the following geometric reference (regardless of target body):"
- **Longitude Domain = 360** Longitudes will be reported in the
range of 0 to 360 degrees (not -180 to 180)
- **Latitude System = Ocentric** Versus Ographic; Note: there is
not difference for a spherical body
- **Longitude Direction = East** Longitude values increase to the
east
Definitions for the geometric reference terms can be found in [Learning About Map Projections](../camera-geometry-and-projections/learning-about-map-projections.md)
## Camera Information Applications
-----
### **Camstats**
For a given image cube, the application
[**camstats**](http://isis.astrogeology.usgs.gov/Application/presentation/Tabbed/camstats/camstats.html)
will report Minimum, Maximum, Average and Standard Deviation for the
following:
**Geometric Information**
- Latitude
- Longitude
- Resolution, LineResolution, SampleResolution
- AspectRatio
**Photometric Information**
- Phase Angle
- Emission Angle
- Incidence Angle
- LocalSolarTime
- NorthAzimuth
Example (not all parameters shown):
camstats from=xxxx.cub linc=1 sinc=1
!!! Note " The *linc* and *sinc* parameters default to 1. For larger pixel size images, such as HiRISE or CTX data, setting the *linc* and *sinc* values to higher values (10, 100) would help the application to run faster. Set with care knowing that the application is literally skipping line/sample data to retrieve SPICE information."
- **camstats** supplies useful information that can be considered and
applied when map projecting images (Level2 processing).
### **Mosrange**
Given a list of multiple raw image cubes, the application
[**mosrange**](http://isis.astrogeology.usgs.gov/Application/presentation/Tabbed/mosrange/mosrange.html)
computes the range of latitude/longitude and resolution statistics for
all images given.
Example (not all parameters shown):
mosrange fromlist=list_of_lev0_w_spice.lis to=output_map_information.map projection=Equirectangular
- This is one application that allows the user to specify output
latitude type, longitude direction and longitude domain.
- Knowing the information about your set of images at this point is
useful, especially if the goal is to generate a mosaic. The output
can be used later in defining the desired output map projection in
Level 2 processing.
### **Campt**
The application
[**campt**](http://isis.astrogeology.usgs.gov/Application/presentation/Tabbed/campt/campt.html)
will supply geometric and photometric information based on a *single*
latitude/longitude value (remember the raw camera geometry defaults when
entering values) or a *single* line/sample coordinate of an image cube.
**Geometric Information**
- Latitude
- Longitude
- Resolution
**Photometric Information**
- Phase Angle
- Emission Angle
- Incidence Angle
**In addition** , this application will return a list of other
spacecraft, sun and instrument related information such as:
- SpacecraftPosition
- SpacecraftAzimuth
- SubSpacecraftLongitude
- SubSolarLatitude
- SubSolarLongitude
- Time information (EphemerisTime, UTC)
Example (not all parameters shown):
campt from=xxxx.cub latitude=0.0 longitude=270.0 type=ground
or
Example (not all parameters shown):
*Enter line/sample pixel location-current default of application*
campt from=xxxx.cub line=512 sample=512 type=image
### **Phocube**
[**phocube**](http://isis.astrogeology.usgs.gov/Application/presentation/Tabbed/phocube/phocube.html)
will compute and generate a separate output [multi-band ISIS
cube](../isis-fundamentals/cube-format.md) where each band will represent the selected
(parameter=TRUE) geometric and photometric elements. The bands are named
appropriately in the output cube labels: **Group=BandBin** .
```
Object = IsisCube
Object = Core
StartByte = 65537
Format = Tile
TileSamples = 128
TileLines = 128
Group = Dimensions
Samples = 1024
Lines = 1024
Bands = 6
End_Group
Group = Pixels
Type = Real
ByteOrder = Lsb
Base = 0.0
Multiplier = 1.0
End_Group
End_Object
Group = BandBin
Name = ("Phase Angle", "Emission Angle", "Incidence Angle", "Latitude", "Longitude")
End_Group
```
- **phocube** requires a successful **spiceinit** execution
- **phocube** can be applied to an unprojected "Level1" image cube or
an individual map projected "Level2" image.
- **phocube** will not work on a mosaic cube, the photometric
information for each input file is eliminated from the mosaic output
file.
Example:
Run **phocube** on a fly-by Cassini ISS-Wide Angle Camera image of
Enceladus. In this example, **phocube** will generate a 6-band output
cube.
@TODO
!!! Note "The image used in this example has been processed through Level1 \[ingestion, spiceinit and radiometric calibration\]. Refer to: [Working with Cassini ISS Data](camera-geometry.md)"
Each band will contain the information asked for (parameters set to
true) in the following command:
phocube from=W1487302209_2.lev1.cub to=W1487302209_2_pho.cub
phase=true emission=true incidence=true latitude=true longitude=true
- All bands of the phocube output can be displayed in qview
- To access a selected band in an application, use the cube-attribute
syntax.
For example, calculate and report the average values of the Incidence
Angle (Band 3).
The command line for the **stats** applications is as follows:
stats from=W1487302209_2_pho.cub+3 to=W1487302209_2_inc_stats.pvl
The Example ISS Wide-Angle Camera image of Enceladus and the output of
**phocube** :
<figure class="inline" markdown>
{: style="width:225px;height:225px"}
<figcaption>Enceladus</figcaption>
</figure>
<figure class="inline" markdown>
{: style="width:225px;height:225px"}
<figcaption>Phocube: Emission Angle Band</figcaption>
</figure>
<figure markdown>
{: style="width:225px;height:225px"}
<figcaption>Phocube: Incidence Angle Band</figcaption>
</figure>
<figure class="inline" markdown>
{: style="width:225px;height:225px"}
<figcaption>Phocube: Phase Angle Band</figcaption>
</figure>
<figure class="inline" markdown>
{: style="width:225px;height:225px"}
<figcaption>Phocube: Latitude Band</figcaption>
</figure>
<figure markdown>
{: style="width:225px;height:225px"}
<figcaption>Phocube: Longitude Band</figcaption>
</figure>