Creating the Conceptual Model is necessary when there is the intention of performing advanced vectorial editions in the database.
Note: TerraAmazon does not automatically create the Conceptual Model given that the size of the box of the cells layer created in the process depends on the area in which there is the need to work on.
To create the Conceptual Model, go to the menu ADMINISTRATION → CREATE CONCEPTUAL MODEL.
Select an existing data source in the list or by clicking on the icon to select one.
To check if connection information is correct click on the Test button.
Then click on the Open button.
Many TerraAmazon operations are based on the existence of this layer, such as the entire classification process. Its dimensions depend on the user´s needs.
Name: provide a name for the cell layer.
Projection: click on the icon to access the projection setting interface, shown in the next figure. (See Spatial Reference System)
SRSs recently used - select the SRID from here.
SRSs Available - select the SRS from one of the lists (Geographic, Projected, User Defined)
Filter - optionally, to help finding a SRS, enter a meaningful word (or a SRID) to see a subset of SRSs which contain that word (or that SRID) at the list of SRSs available.
Proj4 description - it is a informative field containing all parameters of the chosen SRID.
Click on the OK
Note:
To make it easier to find the SRS type you can use the Filter
field.
Back in the
Conceptual Model interface, type the box extents for the cells layer
by filling the fields LL(x), UR(x), LL(y),
UR(y), being LL = “lower
left”, UR = “upper right” if Layer Box is checked.
If Country Box is
checked choose the country and values above will be automatically
filled.
Resolution:
provide a resolution, or width, for the cells. This resolution is the
same on horizontal e vertical directions since cells are square
geometries.
In
this resolution field, the measurement
unit is defined by the
selected projection, as informed in the Unit
field of the Projection interface. It can be verified at the
right of the Projection button.
In this example, the unit is Decimal Degrees.
Note:
The values provided for the countries are originally in LatLong/WGS84
Spherical. When the conceptual model must be created in a different
projection, use the Projection
button as usual. The
original values of the countries´ box will be submitted to
reprojection after the creation of the layer is triggered.
Additionally, if there is a need to update values of the country
boxes, users can edit the file country_box.csv
found in the folder where TerraAmazon has been installed.
Click on the OK
button to apply the informed values and trigger the creation of
the Conceptual Model.
If
necessary, it is possible to create a new cell layer by accessing the
menu LAYER → CREATE CELL LAYER. Even though it is possible to
create as many cell layers as needed, only one of them can be active
on the database. That will be the layer used by the classification
process and must have the same projection as the other layers
involved in the classification rules. If necessary, change the active
cell layer by right clicking on the desired cell layer and selecting
the option Set As Cell Layer. This update takes effect
immediately.