commuf.blogg.se - Surpac inverse distance squared block

Use Surfaces > DTM file functions > Create Trend outlines from DTM triangles to create a string file from the trend DTM surface. Using the mid plane as trend plane for grade continuity inside the solid

Note: Smoothing of local angles may be required so please do this carefully.

Digitize on a section basis the lines of grade continuity and create the trend DTM surface.

“Database > Composite> By geological constraints” and form a DTM of this point data.

In case the domain information is already in the database, extract the composite by Geology for each domain at the mid-point of intersection intervals.

In case of an upper and lower surface are defining the orebody, you can use “Surfaces> Advanced options> Maths between surfaces” to create the mid-plane (HW & FW, or stratified deposits).

The trend surface can be created in numerous ways: This surface should honor the different variations in dip and dip direction (trend) of the mineralization. This process uses mainly block model attributes to store the orientation of the search ellipsoid and consider these parameters during the block value estimation. What is the process for dynamic anisotropy in Surpac? You also may not have sufficient samples in a subdomain to model a decent variogram.įrom Surpac 6.7.1 onwards, it is possible to perform dynamic anisotropy to define the search parameters for Inverse distance, Nearest Neighbour, Ordinary Kriging and Simple Kriging.

For each subdomain, a variogram will be calculated and modeled. Note that for complex orebodies, dozen of subdomains may be required, hence “subdomaining” may be time consuming and an error prone process. A common approach was to create “subdomains”. But when this grade continuity within the domain is folded, the estimation can be biased by the misalignment of the search definition to the direction of the grade continuity. The traditional estimation process is to use a single search ellipsoid within a domain.

A variety of solutions can be used to reduce the bias in the search parameters during block model estimation, one of which is dynamic anisotropy interpolation.ĭynamic anisotropy interpolation is an estimation method which takes into consideration the local variation of the domain orientation into the block estimation.

Grade estimation for undulating or folded deposits can often be challenging.