Template: Veg Cover
Description: Stand Age
SA Variables
| Variable | Required | Multiple | Units | Description |
|---|---|---|---|---|
| SA | R | M | years | Stand age The age of standing live trees. Stand age is typically only reported for forest ecosystems. If reporting stand age for non-forest ecosystems, describe details in Approach. |
| SA_STATISTIC | R | M | LIST(STATISTIC) | Stand age statistic The statistic for the measurement reported. Use predefined list (e.g., mean, min / max, standard deviation, etc). If appropriate, report the type of statistic (e.g., spatial for spatial standard deviation) in STATISTIC_TYPE. |
| SA_STATISTIC_TYPE | Optional | M | LIST(STATISTIC_TYPE) | Stand age statistic type The type of statistic reported if appropriate (e.g., spatial). Use predefined list. |
| SA_STATISTIC_NUMBER | Optional | M | integer number | Number of observations used to determine stand age statistic Number of observations (samples / replicates) used to calculate the STATISTIC for the reported measurement. |
| SA_APPROACH | Optional | M | free text | Stand age measurement approach |
| SA_DATE | Ra | M | YYYYMMDDHHMM | Stand age measurement date Please report the date at the precision known. Allowed reporting precisions are YYYY, YYYYMM, YYYYMMDD, and YYYYMMDDHHMM. For measurements conducted during a campaign or for temporal averages, use DATE_START and DATE_END instead of DATE. |
| SA_DATE_START | Ra | M | YYYYMMDDHHMM | Start date of stand age measurment Start date of a measurement campaign or start date of a temporal average. Please report the date at the precision known. Allowed reporting precisions are YYYY, YYYYMM, YYYYMMDD, and YYYYMMDDHHMM. |
| SA_DATE_END | Optional | M | YYYYMMDDHHMM | End date of stand age measurment End date of a measurement campaign or end date of a temporal average. Please report the date at the precision known. Allowed reporting precisions are YYYY, YYYYMM, YYYYMMDD, and YYYYMMDDHHMM. |
| SA_DATE_UNC | Optional | M | days | Uncertainty in the stand age measurement date If uncertainty in the start date differs than end date, report the uncertainty for start date here in DATE_UNC and the uncertainty for end date in Comments. |
| SA_COMMENT | Optional | M | free text | Stand age comments |
STATISTIC Options (back to top)
| Option | Definition |
|---|---|
| Minimum | Minimum value |
| 1st Percentile | Quantile at 1% of distribution |
| 5th Percentile | Quantile at 5% of distribution |
| 10th Percentile | Quantile at 10% of distribution |
| 25th Percentile | Quantile at 25% of distribution |
| Median – 50th Percentile | Median – Quantile at 50% of distribution |
| 75th Percentile | Quantile at 75% of distribution |
| 90th Percentile | Quantile at 90% of distribution |
| 95th Percentile | Quantile at 95% of distribution |
| 99th Percentile | Quantile at 99% of distribution |
| Maximum | Maximum value |
| Mean | Average (mean) value of sample population |
| Standard Deviation | Standard deviation may be reported from a sample population that consists of individual or aggregated samples (observations). If the distinction is important, specify in Comments. |
| Measurement Uncertainty | Report uncertainty as a plus or minus value in the measurement units. For example, enter 1.5 for +/- 1.5 units. Uncertainty may be reported from the instrument’s specifications, determined empirically, or estimated by the tower team. Please describe such details in Approach. For uncertainty values that are better described by a range, a percent, or other, please enter information in Comments. |
| Single observation | Single observation |
| Expert estimate | Estimate made by expert familiar with site |
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STATISTIC_TYPE Options (back to top)
| Option | Definition |
|---|---|
| Spatial | The statistic indicated is a metric that describes the spatial component of the sample population. For example, use spatial for the standard devation of samples (observations) that represents different locations at the site for the same time period. |
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