# Level 3 Aerosol Index gridded product

**URL:** https://forum.atmospherictoolbox.org/t/level-3-aerosol-index-gridded-product/198
**Category:** Uncategorized
**Created:** [August 12, 2020, 10:26am UTC](https://forum.atmospherictoolbox.org/t/level-3-aerosol-index-gridded-product/198 "2020-08-12T10:26:28Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Yosef](https://forum.atmospherictoolbox.org/letter_avatar_proxy/v4/letter/y/53a042/32.png) [@Yosef](https://forum.atmospherictoolbox.org/u/Yosef)
#### Post date: [August 12, 2020, 10:26am UTC](https://forum.atmospherictoolbox.org/t/level-3-aerosol-index-gridded-product/198/1 "2020-08-12T10:26:28Z")

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Dear Sander,

I have a problem when I try to process the Sentinel-5p Level 2 products to keep a single grid per orbit (level 3 – L3). I don’t understand how to define ingestion options using the -o parameter for example -o 'wavelength\_ratio=354\_338nm.

I have written the code below but something went wrong.

I will be very grateful if you could correct this error.

Best regards

The code is:

(base) PS C:\> harpconvert -a ‘bin(); squash(time, (latitude,longitude))’ -o ‘wavelength\_ratio=354\_338 nm; -a ‘latitude \> -55 [degree\_north]; latitude \< 60 [degree\_north]; longitude \> 18 [degree\_east]; longitude \< 25 [degree\_east]; bin\_spatial(180,-55,0.1,280,18,0.1); derive(latitude {latitude}); derive(longitude {longitude})’ \Users\Yosef\Desktop\July\AAI\Originol\S5P\_OFFL\_L2\_\_AER\_AI\_20200708T084852\_20200708T103022\_14173\_01\_010302\_20200709T223341.nc \Users\Yosef\Desktop\July\AAI\Processing\AII\_8.nc

ERROR: syntax error: trailing characters after option value

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<div class="post-metadata">

### Author: ![sander.niemeijer](https://forum.atmospherictoolbox.org/user_avatar/forum.atmospherictoolbox.org/sander.niemeijer/32/5_2.png) [@sander.niemeijer](https://forum.atmospherictoolbox.org/u/sander.niemeijer)
#### Post date: [August 18, 2020, 11:14am UTC](https://forum.atmospherictoolbox.org/t/level-3-aerosol-index-gridded-product/198/2 "2020-08-18T11:14:20Z")

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Please check your command line options carefully. You can’t specify the -a option twice. And you are not closing the -o option properly.

You probably want something like:

harpconvert -o ‘wavelength\_ratio=354\_338nm’ -a ‘latitude \> -55 [degree\_north]; latitude \< 60 [degree\_north]; longitude \> 18 [degree\_east]; longitude \< 25 [degree\_east]; bin\_spatial(180,-55,0.1,280,18,0.1); derive(latitude {latitude}); derive(longitude {longitude})’ -ap ‘bin(); squash(time, (latitude,longitude))’

But note that 354\_338nm is already the default. You should use 340\_380nm to get something else.