The 300 Index is a measure of site productivity, representing the mean annual 042313_0442_etssupportw1increment of stem volume of a Radiata crop at age 30 with a stocking of 300 SPH. This is often used for planning forest management activity and monitoring site productivity.   GeoMaster includes the ability to calculate and update the 300 Index for a ‘patch’.  A ‘patch’ being a single piece of land with a consistent land use and treatment history i.e. a stand may contain multiple patches.

Parameters obtained from GeoMaster (required fields) for use in the calculation of the 300 Index include:

  • Latitude, Longitude (obtained automatically via the GIS), Altitude
  • Planting Date
  • Species
  • Initial Stocking
  • Pruning’s (age, pruned height, pruned SPH)
  • Thinning’s (age residual SPH, thinning type: waste/production)
  • Latest full inventory data – SPH, MTH, BA (if no MTH is recorded but there is a MCH this will be substituted. If no BA but DBH is present this will be converted to provide a BA.
  • Planned harvest age, if no planned harvest date is recorded the default is 30 years.

If fields are missing or species other than radiata have been included an error list produced showing what fields in what areas are missing from what patches.


Patches with Attitude Missing when trying to Calculate the 300 Index

If all inputs meet the requirements of the 300 Index calculator the 300 Index values of patches will be updated.


300 Index Value Stored at the Patch Level in GeoMaster


As GeoMaster links seamlessly to GIS the 300 Index values can be shown spatially to show the site productivity of a forest.


300 Index Showing Spatially linking Directly with GeoMaster

GeoMaster cloud services provision of Interpine is available via a simple monthly fee structure. If you would more information on this please contact us via our feedback form, or view our Online Cloud Services Information.

A little more about ATLAS GeoMaster Forest Stand Records System: stand record system forest management GIS

  • Typical events recorded by GeoMaster include: Assessments, Blanking, Change Area, Carbon Assessment, Clearfell, Crop Protection, Disestablishment, Disturbance, Fertilize, Foliar Sample, Oversow, Planting, Pruning, Site Preparation, Thinning and of course general notes.
  • Typical reports by GeoMaster include: Age Class, Area Change, Carbon Assessment Areas, Chemical Usage, Compartments, Croptypes, Forest Summaries, Height and Age, National Forest Exotic Description (NFED) Annual Submissions, Operations, Patches, Stand Maps, Operation Maps, Stand Yield, Stands, Stock Book, Work Programs, and of course a range of custom reports and SQL queries output formats.

Download a PDF version of this article.  Interpine – How to Calulate 300 Index.pdf