Name	Yasushi Ishigooka
Organization	Institute for Agro-Environmental Sciences, NARO (NIAES)
Address	3-1-3 Kannondai, Tsukuba, Ibaraki, 305-8604, Japan
TEL	029-838-8207
E-mail	ishigooka.yasushi282@naro.go.jp, isigo@affrc.go.jp

The Historical Gridded Meteorological Dataset in Japan (HGMD-Japan) is a grided high-resolution (1km x 1km, approximately) daily (and in some cases hourly or yearly) meteorological datasets, intended for use in agricultural climate change analysis, created from 1978 to the latest year continuously.

The daily data were created by overlaying the spatially interpolated differences between observed and climate normal at the meteorological observation stations onto the 1km resolution gridded climate data. In this process, in order to maintain time-series homogeneity in each variable, possible source of time-series heterogeneities unrelated to climate change, such as changes in statistical methods and instrument types, were corrected as much as possible.

The details of this dataset are described as follows.

■ Common items

Projection: Geographic

Geodetic system: Tokyo Datum

◆ Daily data

Directory structure:

HGMDJ_NARO(YYYY)daily[file]

File name:

(YYYY)_d_(element).bin

Element name (element):

Mean temperatures (tmp) [0.1 °C]

Maximum temperatures (hourly) (tmx) [0.1 °C]

Minimum temperatures (hourly) (tmn) [0.1 °C]

Precipitation (pre) [0.1 mm]

Solar radiation (srd) [0.1 MJ/m2/d]

Sunshine duration (sdr) [0.1 hour]

Relative humidity (rhu) [0.1 %]

Wind speed at 2.5m height (wsd) [0.1 m/s]

Downward long wave radiation (lrd) [0.1 MJ/ m2/d]

Potential evapotranspiration (pet) [0.1 mm]

FAO reference evapotranspiration (eto) [0.1 mm]

Paddy water temperature (LAI=0) (tw0) [0.1 °C]

Paddy water temperature (LAI=∞) (twi) [0.1 °C]

Error value:

-999

Record format:

Data format: Binary format (little endian)

Data size: 278,237,440 bytes

Record length: 736 bytes (4+366*2: see below)

Number of rows (meshes): 378040

Structure:

1) 3rd mesh code (4 byte long), data (2 byte short) x 366 days

2) 3rd mesh code (4 byte long), data (2 byte short) x 366 days

・・・

378040) 3rd mesh code (4 byte long), data (2 byte short) x 366 days

* Dummy (-999) for the 366th day in no-leap years

◆ Hourly data

Directory structure:

HGMDJ_NARO(YYYY)hourly[element][file]

File name:

(YYYYMMDD)_h_(element).bin

Element name (element):

Rice panicle temperatures (tp) [0.1 °C]

Air temperatures (ta) [0.1 °C]

Error value:

-999

Record format:

Data format: Binary format (little endian)

Data size: 19,658,080 bytes

Record length: 52 bytes (4+24*2: see below)

Number of rows (meshes): 378040

Structure:

1) 3rd mesh code (4 byte long), data (2 byte short) x 24 hours

2) 3rd mesh code (4 byte long), data (2 byte short) x 24 hours

・・・

378040) 3rd mesh code (4 byte long), data (2 byte short) x 24 hours

◆ Yearly data

Directory structure:

HGMDJ_NARO(YYYY)yearly[file]

File name:

(YYYY)_y_(element).bin

Element name (element):

Heat-dose of daily maximum temperature above 35 ℃ (HD_x35) (hdx35) [0.1 °C day]

Heat-dose of daily minimum temperature above 25 ℃ (HD_n25) (hdn25) [0.1 °C day]

Heat-dose of daily mean temperature above 26 ℃ (HD_m26) (hdm26) [0.1 °C day]

Mean air temperature during 20 days after heading date (hed20atm) [0.1 °C]

HD_m26 during 20 days after heading date (hed20hdm26) [0.1 °C day]

Mean panicle temperature during daytime within 5 days around heading date (ptm5dc) [0.1 °C]

Mean panicle temperature during daytime within 7 days around heading date (ptm7dc) [0.1 °C]

Error value:

-999

Record format:

Data format: Binary format (little endian)

Data size: 2,268,240 bytes

Record length: 6 bytes (4+2: see below)

Number of rows (meshes): 378040

Structure:

1) 3rd mesh code (4 byte long), data (2 byte short)

2) 3rd mesh code (4 byte long), data (2 byte short)

・・・

378040) 3rd mesh code (4 byte long), data (2 byte short)

Begin Date	1978-01-01
End Date	Under Continuation
Temporal Characteristics	Daily

North bound latitude	46
West bound longitude	122
Eastbound longitude	146
South bound latitude	24

Dimension Name	Dimension Size (slice number of the dimension)	Resolution Unit
row	2640	30 (second)
column	1920	45 (second)
time		1 (hour)

name	version	specification
binary (original format)	no information

Do not provide this data to third parties without permission.

Use of this dataset is limited to non-commercial use.

Data provider creator is not responsible for any damages resulting from the use of this data.

It is requested to cite references if the data are used.