Home | Start with Gridat | Data and GridatProject | Create a Post map | Statistical parameters | Variography and Variograms | Estimation and Simulation | Gridat tools
Variography and Variograms
While your data sheet is
activated, select "Variogram" from "Modeling" menu
[1].
"Model Setting" window will be
appeared.
Select the data columns you
intended to use as X, Y, Z and W
[2].
There is some initial
statistical information about your data file here.
You may intend to use data
collected from districted area.
Set your data limits here.
Default values cover all data, recorded to the active data sheet
[3].
You could reload default values
by clicking refresh signs.
If you want to remove suspected data or highly suspected data from your process, check the appropriate checkbox here [4].
There is another tab labeled "Variogram"
.You can determine the initial settings for verifying process.e is another tab labeled "Variogram"
.You can determine the initial settings for verifying process.
Select "Variogram" tab and see
how you could determine initial parameters for verifying.
There are three main areas
here:
At "Modeling Options"
[5], you could
select the Variogram model type. All ordinary types like spherical, quadratic,
linear, power and … are available.
Gridat fit a Variogram model to Variography values, according to the
Variogram type, you’ve selected. The amount set as precision related to the
accuracy of the model
Gridat created. The figure 5 is often suitable.
If you check "Manual Model"
then you had to insert nugget effect at "C0", scale at "C" and Range at "a"
manually.
Gridat models are often accurate.
Therefore leave "Manual Model" unchecked. If
Gridat result was not satisfied, then
use manual modeling and change search options settings and Variogram model
parameters to access an acceptable model.
Some default values written
down at the "Search Options"
[6]. Default values are calculated according to the data set and you
can change them manually. If you like to restore default values again click
"Recommended Search Option Values"
[7].
There is a 3D modeling object
available here to help you have a better imagination about search options.
Don’t forget if your data set
obtains a lognormal distribution model you must transform data to normal. Then
select "Normalized" at the "Read Data As" area
[8]. Although
Gridat study your data
normalization and select "Normalized" if it was necessary, but sometimes you may
not agree with
Gridat. Then always be aware about this option.
In addition if you need the
Variogram model for indicator estimation or simulation, you must select
"Indicated" here. The value
Gridat set as the threshold is always third quarter of initial values.
Type you threshold value here
[8].
"Model Setting" window will be closed.anguage:FA">"Model Setting" window will be closed.t;line-height:
150%;font-family:Arial;color:black;mso-bidi-language:FA">"Model Setting" window will be
closed.
Now "Models" tab is activated
and the Variogram is created.
The title of Variogram is shown
at the left side of "Models" tab, indexed by a number
[9].
If you can't see it, select
"Project Explorer" from "View" menu.
You can't change the index but
the title of the map and other options could be edited.
There are several options for
models available on "Property bar", at the right side of Model
[10].
If you can't see it, select
"Model Property Bar" from "View" menu.
Try several changes to being
more familiar with this object.
For example you can change the
color of curve from dark green to red
[11].
All options are not available
for every model. For example "Curves" properties are available just for relative
histogram and Variograms.
If you want to change some
initial settings like data entry properties or Variography parameters, right
click the model and select "Option and Settings" to access "Model Setting"
window again.
When you right click the model a popup menu will be appeared and some commands would be available. These commands are available at "Model Toolbar"
Gridat Support
or contact me
