Daymet V4 provides gridded estimates of daily weather parameters for Continental North America, Hawaii, and Puerto Rico (Data for Puerto Rico is available starting in 1950). It is derived from selected meteorological station data and various supporting data sources.
Compared to the previous version, Daymet V4 provides effective solutions to known issues and further considers improvements to what were believed to be input weather station biases. Improvements include:
Documentation:
Dataset Availability
1980-01-01T00:00:00 - 2020-12-30T00:00:00
Dataset Provider
NASA ORNL DAAC at Oak Ridge National Laboratory
Collection Snippet
ee.ImageCollection("NASA/ORNL/DAYMET_V4")
Resolution
1000 meters
Bands Table
Name | Description | Min* | Max* | Units |
---|---|---|---|---|
dayl | Duration of the daylight period. Based on the period of the day during which the sun is above a hypothetical flat horizon. | 0 | 86400 | seconds |
prcp | Daily total precipitation, sum of all forms converted to water-equivalent. | 0 | 544 | mm |
srad | Incident shortwave radiation flux density, taken as an average over the daylight period of the day. | 0 | 1051 | W/m^2 |
swe | Snow water equivalent, the amount of water contained within the snowpack. | 0 | 13931 | kg/m^2 |
tmax | Daily maximum 2-meter air temperature. | -60 | 60 | °C |
tmin | Daily minimum 2-meter air temperature. | -60 | 42 | °C |
vp | Daily average partial pressure of water vapor. | 0 | 8230 | Pa |
数据引用:
Thornton, M.M., R. Shrestha, Y. Wei, P.E. Thornton, S. Kao, and B.E. Wilson. {YEAR}. Daymet: Daily Surface Weather Data on a 1-km Grid for North America, Version 4. ORNL DAAC, Oak Ridge, Tennessee, USA
Other Citation Details - Thornton, M.M., R. Shrestha, Y. Wei, P.E. Thornton, S. Kao, and B.E. Wilson. 2020. Daymet: Daily Surface Weather Data on a 1-km Grid for North America, Version 4. ORNL DAAC, Oak Ridge, Tennessee, USA. doi:10.3334/ORNLDAAC/1840
代码:
var dataset = ee.ImageCollection('NASA/ORNL/DAYMET_V4')
.filter(ee.Filter.date('2017-04-01', '2017-04-30'));
var maximumTemperature = dataset.select('tmax');
var maximumTemperatureVis = {
min: -40.0,
max: 30.0,
palette: ['1621A2', 'white', 'cyan', 'green', 'yellow', 'orange', 'red'],
};
Map.setCenter(-110.21, 35.1, 4);
Map.addLayer(maximumTemperature, maximumTemperatureVis, 'Maximum Temperature');