html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,performed_via_github_app,issue
https://github.com/pydata/xarray/issues/4203#issuecomment-654688921,https://api.github.com/repos/pydata/xarray/issues/4203,654688921,MDEyOklzc3VlQ29tbWVudDY1NDY4ODkyMQ==,14808389,2020-07-07T08:30:35Z,2020-07-07T15:38:11Z,MEMBER,"that's only the short repr, the values are not modified:
```python
In [5]: da.lat
Out[5]: 
<xarray.DataArray 'lat' (lat: 16100)>
array([37.49944, 37.5004 , 37.50135, ..., 43.1014 , 43.10143, 43.10144])
Coordinates:
  * lat      (lat) float64 37.5 37.5 37.5 37.5 37.5 ... 43.1 43.1 43.1 43.1 43.1
```","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,651101286
https://github.com/pydata/xarray/issues/4203#issuecomment-654210829,https://api.github.com/repos/pydata/xarray/issues/4203,654210829,MDEyOklzc3VlQ29tbWVudDY1NDIxMDgyOQ==,14808389,2020-07-06T12:42:43Z,2020-07-06T12:42:43Z,MEMBER,"thanks, that helps. First of all (unless I did something wrong with the `read_csv` call), there's a `Unnamed: 0` column that has to be removed.

Other than that, your data seems to be quite sparse so that's an ideal fit for [`sparse`](https://sparse.pydata.org):
```python
In [38]: %%time 
    ...: df = pd.read_csv(""/tmp/data.csv"") 
    ...: a = df.drop(""Unnamed: 0"", axis=1).set_index([""lat"", ""lon""]) 
    ...: a = a.stack() 
    ...: a.index.names = [""lat"", ""lon"", ""time""] 
    ...: a = a.sort_index() 
    ...: a.name = ""T"" 
    ...: xr.DataArray.from_series(a, sparse=True) 
    ...:  
    ...:
CPU times: user 606 ms, sys: 63.9 ms, total: 670 ms
Wall time: 670 ms
Out[38]: 
<xarray.DataArray 'T' (lat: 16100, lon: 29959, time: 31)>
<COO: shape=(16100, 29959, 31), dtype=float64, nnz=1003191, fill_value=nan>
Coordinates:
  * lat      (lat) float64 37.5 37.5 37.5 37.5 37.5 ... 43.1 43.1 43.1 43.1 43.1
  * lon      (lon) float64 96.46 96.46 96.46 96.47 ... 102.6 102.6 102.6 102.6
  * time     (time) object '2011-01-01 00:00:00' ... '2011-01-31 00:00:00'
```","{""total_count"": 3, ""+1"": 2, ""-1"": 0, ""laugh"": 0, ""hooray"": 1, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,651101286