Matrix Builder Questions

1. I get all these matrix builder errors and I don't know where to start to fix them. What do you recommend I start with?

1.

I get all these matrix builder errors and I don't know where to start to fix them. What do you recommend I start with?

Many of the errors you discover in this phase of the data preparation may lead you all the way back to your original inventory, the SFMM/WDSTK models or just the XML file. If build errors appear in the left hand window it is important to find where the mis-match occurred: either the inventory doesn’t match the ForestModel or the ForestModel doesn't match the inventory! Remember the XML file is most often derived from the SFMM or Woodstock models, so an incomplete model can lead to an incomplete XML file.

The Matrix Builder provides detailed error messages to help you track down the source of the mis-match. The errors are organized into build categories: features, succession, tracks and products. Within each folder is a list of Block labels representing the blocks that did not match any of the attributes provided in that particular section of the Forest Model.

When you choose a block from the list, stratification information will appear in the window on the right. This information will help you identify the original status of the fragments and which section of the XML file did not provide any attribute information for those stands.

As was mentioned earlier, causes of these errors could be caused by missing information in the XML file, incorrect conversion from the aspatial models, incorrect classification schemes in the original inventory, etc. You really have to just dive in and check it out!

Common blunders learned from experience!

  • Misspelt field names in XML file

  • Different upper and lower cases between database fields and variables

  • Missing values in important inventory fields

  • Miscoded records in the inventory

  • Missing attribute curve information in the SFMM/Woodstock models

  • Multiple path natural and post treatment succession rules