ee.Filter.calendarRange

Returns a filter that passes if the object's timestamp falls within the given range of a calendar field. הערכים month,‏ day_of_year,‏ day_of_month ו-day_of_week מבוססים על 1. השעות הן לפי שעון UTC. השבועות מתחילים ביום שני כיום 1. אם end < start, הבדיקה היא value >= start OR value <= end, כדי לאפשר גלישה.

שימוש	החזרות
ee.Filter.calendarRange(start, end, field)	סינון

ארגומנט	סוג	פרטים
start	מספר שלם	תחילת השדה הרצוי ביומן, כולל.
end	מספר שלם, ברירת מחדל: null	הסוף של השדה הרצוי ביומן, כולל. ברירת המחדל היא אותו ערך כמו start.
field	מחרוזת, ברירת מחדל: day_of_year	שדה היומן לסינון. האפשרויות הן: ‎`year`‎‏, ‎`month`‎‏, ‎`hour`‎‏, ‎`minute`‎‏, ‎`day_of_year`‎‏, ‎`day_of_month`‎ ו-‎ `day_of_week`‎.

דוגמאות

עורך הקוד (JavaScript)

// A Sentinel-2 surface reflectance image collection intersecting the peak of
// Mount Shasta, California, USA.
var ic = ee.ImageCollection('COPERNICUS/S2_SR')
             .filterBounds(ee.Geometry.Point(-122.196, 41.411));

print('Images for a month range (June-August)',
      ic.filter(ee.Filter.calendarRange(6, 8, 'month')));

print('A start value greater than end value is valid (Dec-Feb)',
      ic.filter(ee.Filter.calendarRange(12, 2, 'month')));

// This example uses the 'year' field value. Note that ee.Filter.date is the
// preferred method when filtering by whole years, as it is much faster.
print('Images for a year range (2020-2021)',
      ic.filter(ee.Filter.calendarRange(2020, 2021, 'year')));

// This example uses the 'day_of_year' field value. Note that
// ee.Filter.dayOfYear is the preferred method for filtering by DOY.
// The ee.Date.getRelative function is used to identify DOY from an ee.Date
// object for a representative year. Be mindful of leap years when filtering
// by DOY.
var startDoy = ee.Date('2000-06-01').getRelative('day', 'year');
var endDoy = ee.Date('2000-06-15').getRelative('day', 'year');
print('start DOY =', startDoy,
      'end DOY =', endDoy,
      'Images for a day-of-year range',
      ic.filter(ee.Filter.calendarRange(startDoy, endDoy, 'day_of_year')));

הגדרת Python

מידע על Python API ועל שימוש ב-geemap לפיתוח אינטראקטיבי מופיע בדף Python Environment.

import ee
import geemap.core as geemap

Colab (Python)

# A Sentinel-2 surface reflectance image collection intersecting the peak of
# Mount Shasta, California, USA.
ic = ee.ImageCollection('COPERNICUS/S2_SR').filterBounds(
    ee.Geometry.Point(-122.196, 41.411))

print('Images for a month range (June-August):',
      ic.filter(ee.Filter.calendarRange(6, 8, 'month')).getInfo())

print('A start value greater than end value is valid (Dec-Feb):',
      ic.filter(ee.Filter.calendarRange(12, 2, 'month')).size().getInfo())

# This example uses the 'year' field value. Note that ee.Filter.date is the
# preferred method when filtering by whole years, as it is much faster.
print('Images for a year range (2020-2021):',
      ic.filter(ee.Filter.calendarRange(2020, 2021, 'year')).size().getInfo())

# This example uses the 'day_of_year' field value. Note that
# ee.Filter.dayOfYear is the preferred method for filtering by DOY.
# The ee.Date.getRelative function is used to identify DOY from an ee.Date
# object for a representative year. Be mindful of leap years when filtering
# by DOY.
start_doy = ee.Date('2000-06-01').getRelative('day', 'year')
end_doy = ee.Date('2000-06-15').getRelative('day', 'year')
print('start DOY =', start_doy.getInfo(), 'end DOY =', end_doy.getInfo())
print(
    'Images for a day-of-year range:',
    ic.filter(ee.Filter.calendarRange(start_doy, end_doy, 'day_of_year'))
    .getInfo()
)