Index/Match to determine closest coordinates?

[drogers]

I have a data set that has four columns (i,j,Latitude,Longitude). The i and j represent a grid location on a grid overlaid onto a map projection. Can I use the index function to give me the i and j values for a particular latitude and longitude that I input?
What happens if the Lat/Long coordinates I input are close to but not exactly the same as those in the list? For example what happens the lat/long input happens to be in the middle of a grid point?

The data I am using can be found at http://www.meteo.gc.ca/grib/30kmgridpoints_e.html

Thanks for any help!

 

[MrKowz]

This is what I was able to come up with.

Note: The table must be sorted with Latitude (Ascending) and then by Longitute (Ascending).

The returned values may not be perfect to what you need, but at least it will get you close.

<b>Excel 2003</b><table cellpadding="2.5px" rules="all" style=";background-color: #FFFFFF;border: 1px solid;border-collapse: collapse; border-color: #A6AAB6"><colgroup><col width="25px" style="background-color: #E0E0F0" /><col /><col /><col /><col /><col /><col /><col /><col /></colgroup><thead><tr style=" background-color: #E0E0F0;text-align: center;color: #161120"><th></th><th>A</th><th>B</th><th>C</th><th>D</th><th>E</th><th>F</th><th>G</th><th>H</th></tr></thead><tbody><tr ><td style="color: #161120;text-align: center;">1</td><td style=";">ni</td><td style=";">nj</td><td style=";">Latitude</td><td style=";">Longitude</td><td style="text-align: right;;"></td><td style=";">Latitude</td><td style="text-align: right;;">24.8</td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">2</td><td style="text-align: right;;">247</td><td style="text-align: right;;">1</td><td style="text-align: right;;">24.5363</td><td style="text-align: right;;">-72.3753</td><td style="text-align: right;;"></td><td style=";">Longitude</td><td style="text-align: right;;">-72.71</td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">3</td><td style="text-align: right;;">246</td><td style="text-align: right;;">1</td><td style="text-align: right;;">24.6639</td><td style="text-align: right;;">-72.5515</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">4</td><td style="text-align: right;;">247</td><td style="text-align: right;;">2</td><td style="text-align: right;;">24.6961</td><td style="text-align: right;;">-72.2345</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">5</td><td style="text-align: right;;">245</td><td style="text-align: right;;">1</td><td style="text-align: right;;">24.7911</td><td style="text-align: right;;">-72.7285</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">6</td><td style="text-align: right;;">246</td><td style="text-align: right;;">2</td><td style="text-align: right;;">24.8243</td><td style="text-align: right;;">-72.4108</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style=";">Both values below</td><td style=";">At least one value larger</td></tr><tr ><td style="color: #161120;text-align: center;">7</td><td style="text-align: right;;">247</td><td style="text-align: right;;">3</td><td style="text-align: right;;">24.856</td><td style="text-align: right;;">-72.0928</td><td style="text-align: right;;"></td><td style=";">ni</td><td style="text-align: right;;">245</td><td style="text-align: right;;">246</td></tr><tr ><td style="color: #161120;text-align: center;">8</td><td style="text-align: right;;">244</td><td style="text-align: right;;">1</td><td style="text-align: right;;">24.9181</td><td style="text-align: right;;">-72.9064</td><td style="text-align: right;;"></td><td style=";">nj</td><td style="text-align: right;;">1</td><td style="text-align: right;;">2</td></tr><tr ><td style="color: #161120;text-align: center;">9</td><td style="text-align: right;;">245</td><td style="text-align: right;;">2</td><td style="text-align: right;;">24.9522</td><td style="text-align: right;;">-72.5881</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">10</td><td style="text-align: right;;">246</td><td style="text-align: right;;">3</td><td style="text-align: right;;">24.9848</td><td style="text-align: right;;">-72.2693</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">11</td><td style="text-align: right;;">247</td><td style="text-align: right;;">4</td><td style="text-align: right;;">25.0157</td><td style="text-align: right;;">-71.9502</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">12</td><td style="text-align: right;;">243</td><td style="text-align: right;;">1</td><td style="text-align: right;;">25.0447</td><td style="text-align: right;;">-73.0852</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">13</td><td style="text-align: right;;">244</td><td style="text-align: right;;">2</td><td style="text-align: right;;">25.0798</td><td style="text-align: right;;">-72.7662</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">14</td><td style="text-align: right;;">245</td><td style="text-align: right;;">3</td><td style="text-align: right;;">25.1133</td><td style="text-align: right;;">-72.4468</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">15</td><td style="text-align: right;;">246</td><td style="text-align: right;;">4</td><td style="text-align: right;;">25.1452</td><td style="text-align: right;;">-72.1269</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">16</td><td style="text-align: right;;">242</td><td style="text-align: right;;">1</td><td style="text-align: right;;">25.171</td><td style="text-align: right;;">-73.2648</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">17</td><td style="text-align: right;;">247</td><td style="text-align: right;;">5</td><td style="text-align: right;;">25.1755</td><td style="text-align: right;;">-71.8067</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">18</td><td style="text-align: right;;">243</td><td style="text-align: right;;">2</td><td style="text-align: right;;">25.207</td><td style="text-align: right;;">-72.9452</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">19</td><td style="text-align: right;;">244</td><td style="text-align: right;;">3</td><td style="text-align: right;;">25.2415</td><td style="text-align: right;;">-72.6251</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr><tr ><td style="color: #161120;text-align: center;">20</td><td style="text-align: right;;">245</td><td style="text-align: right;;">4</td><td style="text-align: right;;">25.2743</td><td style="text-align: right;;">-72.3046</td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td><td style="text-align: right;;"></td></tr></tbody></table><table cellpadding="2.5px" rules="all" style=";background-color: #FFFFFF;border: 1px solid;border-collapse: collapse; border-color: #A6AAB6"><thead><tr style="background-color: #E0E0F0;text-align: center;color: #161120"><th><b>Sheet3</b></th></tr></td></thead></table><br /><br /><table width="85%" cellpadding="2.5px" rules="all" style=";border: 2px solid black;border-collapse:collapse;padding: 0.4em;background-color: #FFFFFF" ><tr><td style="padding:6px" ><b>Array Formulas</b><table cellpadding="2.5px" width="100%" rules="all" style="border: 1px solid;text-align:center;background-color: #FFFFFF;border-collapse: collapse; border-color: #A6AAB6"><thead><tr style=" background-color: #E0E0F0;color: #161120"><th width="10px">Cell</th><th style="text-align:left;padding-left:5px;">Formula</th></tr></thead><tbody><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">G7</th><td style="text-align:left">{=INDEX(<font color="Blue">A2:A49401,MATCH(<font color="Red">9.99E+307,IF(<font color="Green">C2:C49401<G1,IF(<font color="Purple">D2:D49401<G2,1,""</font>)</font>)</font>)</font>)}</td></tr><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">H7</th><td style="text-align:left">{=OFFSET(<font color="Blue">INDEX(<font color="Red">A2:A49401,MATCH(<font color="Green">1,IF(<font color="Purple">A2:A49401=G7,IF(<font color="Teal">B2:B49401=G8,1,""</font>)</font>),0</font>)</font>),1,0</font>)}</td></tr><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">G8</th><td style="text-align:left">{=INDEX(<font color="Blue">B2:B49401,MATCH(<font color="Red">9.99E+307,IF(<font color="Green">C2:C49401<G1,IF(<font color="Purple">D2:D49401<G2,1,""</font>)</font>)</font>)</font>)}</td></tr><tr><th width="10px" style=" background-color: #E0E0F0;color: #161120">H8</th><td style="text-align:left">{=OFFSET(<font color="Blue">INDEX(<font color="Red">B2:B49401,MATCH(<font color="Green">1,IF(<font color="Purple">A2:A49401=G7,IF(<font color="Teal">B2:B49401=G8,1,""</font>)</font>),0</font>)</font>),1,0</font>)}</td></tr></tbody></table><b>Entered with Ctrl+Shift+Enter.</b> If entered correctly, Excel will surround with curly braces {}.
<b>Note: Do not try and enter the {} manually yourself</b></td></tr></table><br />