i-Tree Eco uses plot-based stratified sampling statistics. It does not rely on any remotely sensed data. In essence it calculates the values of interest per unit area from each plot (e.g. trees per acre). It then averages those values to come up with an estimate for each stratum by averaging those p...

Hi Lindsey, That ID field has to be controlled by i-Tree Eco because they are linked to the underlying database structure. Likely what is happening is you may have a duplicate ID or the IDs may be out of order which causes a conflict in the database and Eco subsequently renumbers the rest of the rec...

Hi Paul, Our development team is working on creating full methods documentation for the UK and Sweden adaptation. In the meantime I went ahead and posted a preliminary draft of a document summarizing the data sources that facilitated those expansions. You can find that on our website under the "Meth...

Thanks for the question. Unfortunately, i-Tree Eco cannot handle partial data for some trees in a given inventory. When you turn on any of the recommended variables during project set-up you must provide all of those variables for each of your trees. When you activate only species and dbh the softwa...

Hi Karen, Thanks for the question. It is tough to say exactly what is going on here. It could simply be that the differences in the sizes and species of the trees are enough to account those differences in results. It could also be due to changes in the underlying model. We generally try to incorpor...

Hello, Please email your precipitation data file and the verification results to info@itreetools.org. Without your data it is difficult to diagnose the issue. It could potentially be that you are submitting the data for a leap year but using the template for a non-leap year. Thanks for your question...

Hi, The benefits estimate will be less reliable in Canada. The benefits are estimated by county here in the US. The benefit estimates they rely on measurements of tree leaf area in each county based on the US national forest inventory (FIA), local pollution data, local weather data, and human popula...

Thanks for your question. The area of the stratum does not impact the appropriate number of plots. The number of plots will directly impact the sampling error of your project and if you want to minimize that sampling error you would need to place more plots in strata that have high variability. This...

Thank you for your questions. 1. The land cover classes of a given plot should be determined in terms of percentage, according to the users guideline. However, I couldn't see any mechanism how to estimate the land cover classes at plot level during the field survey. Does it mean estimation based on ...

Unfortunately, we cannot accept new weather station data at this time. The weather station data has very strict formatting requirements and requires information about hourly wind speed, mixing heights, and cloud cover that are not readily available from most weather stations. For more information ab...

There is an issue with a recent automatic Microsoft update that is causing this problem. Essentially, there is an entry in the computer's registry for the 32-bit version of the MS Database Engine however the update removes or disallows the 32-bit version. This issue will be resolved in the next rele...

UPDATE: 7-30-20 The current cost of carbon used in i-Tree Canopy and i-Tree Eco is $170.55/ton of C and this has been updated with the 2019 PPI which was down 1.1% from 2018. We consider this to be in 2020 dollars as it is using the latest available PPI. User's can check on the latest default carbon...

Hi Charlotte, This can be difficult to answer and varies depending on your tree population. If your trees are similar to the ones used to create the models that estimate crown parameters based on dbh then there will be little impact on average. However, for any single tree the differences may be lar...

Hi Charlotte,
Yes, please email your spreadsheet and your packed project to info@itreetools.org. You can create a packed project from the "file" menu in i-Tree Eco then send along the .zip folder that is created.
Thanks,
Jason

Hi Charlotte, The limitations on the "crown: base height" are that it must be greater than 0 and less than the "crown: top height". Additionally, if you have selected to collect "crown size" parameters you must supply valid values for "top height", "base height", "width" (in both directions), and "p...