Hello Ai-geostats list I am developing a sampling plan for a retrospective analysis of deciduous forests. We intend to use airphotos from the 1930s to develop an inventory to compare with the current inventory. The area within our study area that is covered by airphotos is approximately 350,000 ha and we can't afford to map it all, so we are looking a ways of capturing the variation in deciduous distribution and composition using a sample or subset of the photos. One approach we are considering is based on the National Forest Inventory of Canada, which recommends sampling about 1% of the study area using a 20km x 20km grid and 2km x 2km typed areas at the the grid intersections. Other ideas include transects, simple random, or stratified random designs. Any other suggestions or references would be appreciated. Ian Parfitt Nelson, BC -- * To post a message to the list, send it to [EMAIL PROTECTED] * As a general service to the users, please remember to post a summary of any useful responses to your questions. * To unsubscribe, send an email to [EMAIL PROTECTED] with no subject and "unsubscribe ai-geostats" followed by "end" on the next line in the message body. DO NOT SEND Subscribe/Unsubscribe requests to the list * Support to the list is provided at http://www.ai-geostats.org
